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A fortification is a
military A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare. It is typically authorized and maintained by a sovereign state, with its members identifiable by their distinct ...
construction Construction is a general term meaning the art and science to form Physical object, objects, systems, or organizations,"Construction" def. 1.a. 1.b. and 1.c. ''Oxford English Dictionary'' Second Edition on CD-ROM (v. 4.0) Oxford University Pr ...
or
building A building, or edifice, is an enclosed structure with a roof and walls standing more or less permanently in one place, such as a house or factory (although there's also portable buildings). Buildings come in a variety of sizes, shapes, and fu ...
designed for the defense of territories in
war War is an intense armed conflict between states, governments, societies, or paramilitary groups such as mercenaries, insurgents, and militias. It is generally characterized by extreme violence, destruction, and mortality, using regular o ...
fare, and is also used to establish rule in a region during peacetime. The term is derived from
Latin Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power of the ...
''fortis'' ("strong") and ''facere'' ("to make"). From very early history to modern times, defensive walls have often been necessary for cities to survive in an ever-changing world of invasion and conquest. Some settlements in the Indus Valley civilization were the first small cities to be fortified. In
ancient Greece Ancient Greece ( el, Ἑλλάς, Hellás) was a northeastern Mediterranean Sea, Mediterranean civilization, existing from the Greek Dark Ages of the 12th–9th centuries BC to the end of Classical Antiquity, classical antiquity ( AD 600), th ...
, large stone walls had been built in Mycenaean Greece, such as the ancient site of
Mycenae Mycenae ( ; grc, Μυκῆναι or , ''Mykē̂nai'' or ''Mykḗnē'') is an archaeological site near Mykines in Argolis, north-eastern Peloponnese, Greece. It is located about south-west of Athens; north of Argos; and south of Corinth. ...
(famous for the huge stone blocks of its '
cyclopean Cyclopean masonry is a type of stonework found in Mycenaean architecture, built with massive limestone boulders, roughly fitted together with minimal clearance between adjacent stones and with clay mortar or no use of mortar. The boulders typic ...
' walls). A Greek '' phrourion'' was a fortified collection of buildings used as a military garrison, and is the equivalent of the
Roman Roman or Romans most often refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of ancient Rome *'' Epistle to the Romans'', shortened to ''Romans'', a lette ...
castellum or
English English usually refers to: * English language * English people English may also refer to: Peoples, culture, and language * ''English'', an adjective for something of, from, or related to England ** English national ide ...
fortress. These constructions mainly served the purpose of a watch tower, to guard certain roads, passes, and borders. Though smaller than a real fortress, they acted as a border guard rather than a real strongpoint to watch and maintain the border. The art of setting out a military camp or constructing a fortification traditionally has been called "castrametation" since the time of the
Roman legion The Roman legion ( la, legiō, ) was the largest military unit of the Roman army, composed of 5,200 infantry and 300 equites (cavalry) in the period of the Roman Republic (509 BC–27 BC) and of 5,600 infantry and 200 auxilia in the period o ...
s. Fortification is usually divided into two branches: permanent fortification and field fortification. There is also an intermediate branch known as semi-permanent fortification. Castles are fortifications which are regarded as being distinct from the generic fort or fortress in that they are a residence of a
monarch A monarch is a head of stateWebster's II New College DictionarMonarch Houghton Mifflin. Boston. 2001. p. 707. for life or until abdication, and therefore the head of state of a monarchy. A monarch may exercise the highest authority and power i ...
or
noble A noble is a member of the nobility. Noble may also refer to: Places Antarctica * Noble Glacier, King George Island * Noble Nunatak, Marie Byrd Land * Noble Peak, Wiencke Island * Noble Rocks, Graham Land Australia * Noble Island, Gr ...
and command a specific defensive territory.
Roman forts In the Roman Republic and the Roman Empire, the Latin word ''castrum'', plural ''castra'', was a military-related term. In Latin usage, the singular form ''castrum'' meant 'fort', while the plural form ''castra'' meant 'camp'. The singular and ...
and
hill fort A hillfort is a type of earthwork used as a fortified refuge or defended settlement, located to exploit a rise in elevation for defensive advantage. They are typically European and of the Bronze Age or Iron Age. Some were used in the post-Roma ...
s were the main antecedents of castles in
Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a subcontinent of Eurasia and it is located entirel ...
, which emerged in the 9th century in the
Carolingian Empire The Carolingian Empire (800–888) was a large Frankish-dominated empire in western and central Europe during the Early Middle Ages. It was ruled by the Carolingian dynasty, which had ruled as kings of the Franks since 751 and as kings of the ...
. The
Early Middle Ages The Early Middle Ages (or early medieval period), sometimes controversially referred to as the Dark Ages, is typically regarded by historians as lasting from the late 5th or early 6th century to the 10th century. They marked the start of the Mi ...
saw the creation of some towns built around castles. Medieval-style fortifications were largely made obsolete by the arrival of
cannon A cannon is a large- caliber gun classified as a type of artillery, which usually launches a projectile using explosive chemical propellant. Gunpowder ("black powder") was the primary propellant before the invention of smokeless powder ...
s in the 14th century. Fortifications in the age of black powder evolved into much lower structures with greater use of
ditches A ditch is a small to moderate divot created to channel water. A ditch can be used for drainage, to drain water from low-lying areas, alongside roadways or fields, or to channel water from a more distant source for plant irrigation. Ditches ar ...
and
earth Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surfa ...
ramparts that would absorb and disperse the energy of cannon fire. Walls exposed to direct cannon fire were very vulnerable, so the walls were sunk into ditches fronted by earth slopes to improve protection. The arrival of
explosive shell A shell, in a military context, is a projectile whose payload contains an explosive, incendiary, or other chemical filling. Originally it was called a bombshell, but "shell" has come to be unambiguous in a military context. Modern usage ...
s in the 19th century led to yet another stage in the evolution of fortification. Star forts did not fare well against the effects of high explosive, and the intricate arrangements of bastions, flanking batteries and the carefully constructed lines of fire for the defending cannon could be rapidly disrupted by explosive shells. Steel-and-
concrete Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. Concrete is the second-most-used substance in the world after water, and is the most wid ...
fortifications were common during the 19th and early 20th centuries. The advances in modern warfare since
World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
have made large-scale fortifications obsolete in most situations.


Nomenclature

Many United States Army installations are known as ''forts'', although they are not always fortified. Indeed, during the pioneering era of North America, many outposts on the frontiers, even non-military outposts, were referred to generically as ''forts''. Larger military installations may be called ''fortresses''; smaller ones were once known as ''fortalices''. The word ''fortification'' can also refer to the practice of improving an area's defense with defensive works. City
walls Walls may refer to: *The plural of wall, a structure *Walls (surname), a list of notable people with the surname Places * Walls, Louisiana, United States * Walls, Mississippi, United States * Walls, Ontario, neighborhood in Perry, Ontario, C ...
are fortifications but are not necessarily called ''fortresses''. The art of setting out a military camp or constructing a fortification traditionally has been called '' castrametation'' since the time of the
Roman legion The Roman legion ( la, legiō, ) was the largest military unit of the Roman army, composed of 5,200 infantry and 300 equites (cavalry) in the period of the Roman Republic (509 BC–27 BC) and of 5,600 infantry and 200 auxilia in the period o ...
s. The art/science of laying
siege A siege is a military blockade of a city, or fortress, with the intent of conquering by attrition, or a well-prepared assault. This derives from la, sedere, lit=to sit. Siege warfare is a form of constant, low-intensity conflict characteriz ...
to a fortification and of destroying it is commonly called ''
siegecraft A siege is a military blockade of a city, or fortress, with the intent of conquering by attrition, or a well-prepared assault. This derives from la, sedere, lit=to sit. Siege warfare is a form of constant, low-intensity conflict characterize ...
'' or ''siege warfare'' and is formally known as ''
poliorcetics A siege is a military blockade of a city, or fortress, with the intent of conquering by attrition, or a well-prepared assault. This derives from la, sedere, lit=to sit. Siege warfare is a form of constant, low-intensity conflict characterize ...
''. In some texts this latter term also applies to the art of building a fortification. Fortification is usually divided into two branches: permanent fortification and field fortification. Permanent fortifications are erected at leisure, with all the resources that a state can supply of constructive and
mechanical Mechanical may refer to: Machine * Machine (mechanical), a system of mechanisms that shape the actuator input to achieve a specific application of output forces and movement * Mechanical calculator, a device used to perform the basic operations of ...
skill, and are built of enduring materials. Field fortifications—for example
breastworks A breastwork is a temporary fortification, often an earthwork thrown up to breast height to provide protection to defenders firing over it from a standing position. A more permanent structure, normally in stone, would be described as a parapet o ...
—and often known as ''fieldworks'' or ''earthworks'', are extemporized by troops in the field, perhaps assisted by such local labour and tools as may be procurable and with materials that do not require much preparation, such as
earth Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surfa ...
, brushwood and light
timber Lumber is wood that has been processed into dimensional lumber, including beams and planks or boards, a stage in the process of wood production. Lumber is mainly used for construction framing, as well as finishing (floors, wall panels, w ...
, or sandbags (see sangar). An example of field fortification was the construction of
Fort Necessity Fort Necessity National Battlefield is a National Battlefield in Fayette County, Pennsylvania, United States, which preserves the site of the Battle of Fort Necessity. The battle, which took place on July 3, 1754, was an early battle of the ...
by George Washington in 1754. There is also an intermediate branch known as ''semi-permanent fortification''. This is employed when in the course of a campaign it becomes desirable to protect some locality with the best imitation of permanent defences that can be made in a short time, ample resources and skilled civilian labour being available. An example of this is the construction of Roman forts in England and in other Roman territories where camps were set up with the intention of staying for some time, but not permanently. Castles are fortifications which are regarded as being distinct from the generic fort or fortress in that it describes a residence of a
monarch A monarch is a head of stateWebster's II New College DictionarMonarch Houghton Mifflin. Boston. 2001. p. 707. for life or until abdication, and therefore the head of state of a monarchy. A monarch may exercise the highest authority and power i ...
or
noble A noble is a member of the nobility. Noble may also refer to: Places Antarctica * Noble Glacier, King George Island * Noble Nunatak, Marie Byrd Land * Noble Peak, Wiencke Island * Noble Rocks, Graham Land Australia * Noble Island, Gr ...
and commands a specific defensive territory. An example of this is the massive medieval castle of
Carcassonne Carcassonne (, also , , ; ; la, Carcaso) is a French fortified city in the department of Aude, in the region of Occitanie. It is the prefecture of the department. Inhabited since the Neolithic, Carcassonne is located in the plain of the Au ...
.


History


Neolithic Europe

From very early history to modern times,
walls Walls may refer to: *The plural of wall, a structure *Walls (surname), a list of notable people with the surname Places * Walls, Louisiana, United States * Walls, Mississippi, United States * Walls, Ontario, neighborhood in Perry, Ontario, C ...
have been a necessity for many cities. In Bulgaria, near the town of
Provadia Provadia ( bg, Провадия ) is a town in northeastern Bulgaria, part of Varna Province, located in a deep karst gorge (Provadia syncline) along the Provadiya River not far from the Bulgarian Black Sea Coast. It is the administrative centre ...
a walled fortified settlement today called
Solnitsata Solnitsata ( bg, Солницата, "The Saltworks") was a prehistoric town located in present-day Bulgaria, near the modern city of Provadia. Believed by archaeologists to be the oldest town in Europe, Solnitsata was a fortified stone settlement ...
starting from 4700 BC had a diameter of about , was home to 350 people living in two-storey houses, and was encircled by a fortified wall. The huge walls around the settlement, which were built very tall and with stone blocks which are high and thick, make it one of the earliest walled settlements in Europe but it is younger than the walled town of
Sesklo Sesklo ( el, Σέσκλο; rup, Seshklu) is a village in Greece that is located near Volos, a city located within the municipality of Aisonia. The municipality is located within the regional unit of Magnesia that is located within the admini ...
in Greece from 6800 BC.
Uruk Uruk, also known as Warka or Warkah, was an ancient city of Sumer (and later of Babylonia) situated east of the present bed of the Euphrates River on the dried-up ancient channel of the Euphrates east of modern Samawah, Al-Muthannā, Iraq.Harm ...
in ancient Sumer (
Mesopotamia Mesopotamia ''Mesopotamíā''; ar, بِلَاد ٱلرَّافِدَيْن or ; syc, ܐܪܡ ܢܗܪ̈ܝܢ, or , ) is a historical region of Western Asia situated within the Tigris–Euphrates river system, in the northern part of the ...
) is one of the world's oldest known
walled cities A defensive wall is a fortification usually used to protect a city, town or other settlement from potential aggressors. The walls can range from simple palisades or earthworks to extensive military fortifications with towers, bastions and gates ...
. The Ancient Egyptians also built fortresses on the frontiers of the Nile Valley to protect against invaders from neighbouring territories, as well as circle-shaped mud brick walls around their cities. Many of the fortifications of the ancient world were built with mud brick, often leaving them no more than mounds of dirt for today's archaeologists. A massive prehistoric stone wall surrounded the ancient temple of
Ness of Brodgar The Ness of Brodgar is an archaeological site covering between the Ring of Brodgar and the Stones of Stenness in the Heart of Neolithic Orkney World Heritage Site in Orkney, Scotland. Excavations at the site began in 2003. The site has provided ...
3200 BC in
Scotland Scotland (, ) is a Countries of the United Kingdom, country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a Anglo-Scottish border, border with England to the southeast ...
. Named the "Great Wall of Brodgar" it was thick and 4 metres tall. The wall had some symbolic or ritualistic function. The Assyrians deployed large labour forces to build new
palaces A palace is a grand residence, especially a royal residence, or the home of a head of state or some other high-ranking dignitary, such as a bishop or archbishop. The word is derived from the Latin name palātium, for Palatine Hill in Rome whic ...
, temples and defensive walls.


Neolithic Indus Valley

Some settlements in the Indus Valley civilization were also fortified. By about 3500 BC, hundreds of small farming villages dotted the Indus floodplain. Many of these settlements had fortifications and planned streets. The stone and mud brick houses of
Kot Diji The ancient site at Kot Diji ( sd, ڪوٽ ڏیجي; ur, کوٹ ڈیجی) was the forerunner of the Indus Civilization. The occupation of this site is attested already at 3300 BCE. The remains consist of two parts; the citadel area on high ground ...
were clustered behind massive stone flood dykes and defensive walls, for neighbouring communities bickered constantly about the control of prime agricultural land.
Mundigak Mundigak ( ps, منډیګک) is an archaeological site in Kandahar province in Afghanistan. During the Bronze Age, it was a center of the Helmand culture. It is situated approximately northwest of Kandahar near Shāh Maqsūd, on the upper draina ...
(c. 2500 BC) in present-day south-east
Afghanistan Afghanistan, officially the Islamic Emirate of Afghanistan,; prs, امارت اسلامی افغانستان is a landlocked country located at the crossroads of Central Asia and South Asia. Referred to as the Heart of Asia, it is bordere ...
has defensive walls and square bastions of sun dried bricks. The entire city of
Kerma Kerma was the capital city of the Kerma culture, which was located in present-day Sudan at least 5,500 years ago. Kerma is one of the largest archaeological sites in ancient Nubia. It has produced decades of extensive excavations and research, i ...
in
Nubia Nubia () (Nobiin: Nobīn, ) is a region along the Nile river encompassing the area between the first cataract of the Nile (just south of Aswan in southern Egypt) and the confluence of the Blue and White Niles (in Khartoum in central Sudan), or ...
was encompassed by fortified walls surrounded by a ditch. Archaeology has revealed various Bronze Age bastions and foundations constructed of stone together with either baked or unfired brick.


Bronze Age Europe

In
Bronze Age The Bronze Age is a historic period, lasting approximately from 3300 BC to 1200 BC, characterized by the use of bronze, the presence of writing in some areas, and other early features of urban civilization. The Bronze Age is the second prin ...
Malta Malta ( , , ), officially the Republic of Malta ( mt, Repubblika ta' Malta ), is an island country in the Mediterranean Sea. It consists of an archipelago, between Italy and Libya, and is often considered a part of Southern Europe. It lies ...
, some settlements also began to be fortified. The most notable surviving example is
Borġ in-Nadur Borġ in-Nadur is an archaeological site located in open fields overlooking St George's Bay, near Birżebbuġa, Malta. It is occupied by a Tarxien phase megalithic temple as well as the remains of a Bronze Age village which includes the earlies ...
, where a bastion built in around 1500 BC was found. Babylon was one of the most famous cities of the ancient world, especially as a result of the building program of Nebuchadnezzar, who expanded the walls and built the
Ishtar Gate The Ishtar Gate was the eighth gate to the inner city of Babylon (in the area of present-day Hillah, Babil Governorate, Iraq). It was constructed circa 575 BCE by order of King Nebuchadnezzar II on the north side of the city. It was pa ...
. Exceptions were few—notably, ancient
Sparta Sparta ( Doric Greek: Σπάρτα, ''Spártā''; Attic Greek: Σπάρτη, ''Spártē'') was a prominent city-state in Laconia, in ancient Greece. In antiquity, the city-state was known as Lacedaemon (, ), while the name Sparta referre ...
and ancient
Rome , established_title = Founded , established_date = 753 BC , founder = King Romulus (legendary) , image_map = Map of comune of Rome (metropolitan city of Capital Rome, region Lazio, Italy).svg , map_caption ...
did not have walls for a long time, choosing to rely on their militaries for defence instead. Initially, these fortifications were simple constructions of wood and earth, which were later replaced by mixed constructions of stones piled on top of each other without mortar. In
ancient Greece Ancient Greece ( el, Ἑλλάς, Hellás) was a northeastern Mediterranean Sea, Mediterranean civilization, existing from the Greek Dark Ages of the 12th–9th centuries BC to the end of Classical Antiquity, classical antiquity ( AD 600), th ...
, large stone walls had been built in Mycenaean Greece, such as the ancient site of
Mycenae Mycenae ( ; grc, Μυκῆναι or , ''Mykē̂nai'' or ''Mykḗnē'') is an archaeological site near Mykines in Argolis, north-eastern Peloponnese, Greece. It is located about south-west of Athens; north of Argos; and south of Corinth. ...
(famous for the huge stone blocks of its '
cyclopean Cyclopean masonry is a type of stonework found in Mycenaean architecture, built with massive limestone boulders, roughly fitted together with minimal clearance between adjacent stones and with clay mortar or no use of mortar. The boulders typic ...
' walls). In
classical era Classical antiquity (also the classical era, classical period or classical age) is the period of cultural history between the 8th century BC and the 5th century AD centred on the Mediterranean Sea, comprising the interlocking civilizations of ...
Greece Greece,, or , romanized: ', officially the Hellenic Republic, is a country in Southeast Europe. It is situated on the southern tip of the Balkans, and is located at the crossroads of Europe, Asia, and Africa. Greece shares land borders ...
, the city of
Athens Athens ( ; el, Αθήνα, Athína ; grc, Ἀθῆναι, Athênai (pl.) ) is both the capital and largest city of Greece. With a population close to four million, it is also the seventh largest city in the European Union. Athens dominates ...
built two parallel stone walls, called the
Long Walls Although long walls were built at several locations in ancient Greece, notably Corinth and Megara, the term Long Walls ( grc, Μακρὰ Τείχη ) generally refers to the walls that connected Athens main city to its ports at Piraeus and Phal ...
, that reached their fortified seaport at
Piraeus Piraeus ( ; el, Πειραιάς ; grc, Πειραιεύς ) is a port city within the Athens urban area ("Greater Athens"), in the Attica region of Greece. It is located southwest of Athens' city centre, along the east coast of the Saron ...
a few miles away. In
Central Europe Central Europe is an area of Europe between Western Europe and Eastern Europe, based on a common historical, social and cultural identity. The Thirty Years' War (1618–1648) between Catholicism and Protestantism significantly shaped the a ...
, the
Celts The Celts (, see pronunciation for different usages) or Celtic peoples () are. "CELTS location: Greater Europe time period: Second millennium B.C.E. to present ancestry: Celtic a collection of Indo-European peoples. "The Celts, an ancien ...
built large fortified settlements known as
oppida An ''oppidum'' (plural ''oppida'') is a large fortified Iron Age settlement or town. ''Oppida'' are primarily associated with the Celtic late La Tène culture, emerging during the 2nd and 1st centuries BC, spread across Europe, stretch ...
, whose walls seem partially influenced by those built in the
Mediterranean The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Western Europe, Western and Southern Europe and Anatolia, on the south by North Africa ...
. The fortifications were continuously being expanded and improved. Around 600 BC, in
Heuneburg The Heuneburg is a prehistoric hillfort by the river Danube in Hundersingen near Herbertingen, between Ulm and Sigmaringen, Baden-Württemberg, in the south of Germany, close to the modern borders with Switzerland and Austria. It is considered ...
, Germany, forts were constructed with a limestone foundation supported by a mudbrick wall approximately 4 metres tall, probably topped by a roofed walkway, thus reaching a total height of 6 metres. The wall was clad with lime plaster, regularly renewed. Towers protruded outwards from it. The
Oppidum of Manching The Oppidum of Manching (german: Oppidum von Manching) was a large Celtic proto-urban or city-like settlement at modern-day Manching, near Ingolstadt, in Bavaria, Germany. The Iron Age town (or oppidum) was founded in the 3rd century BC and exis ...
(German: Oppidum von Manching) was a large Celtic proto-urban or city-like settlement at modern-day Manching (near Ingolstadt), Bavaria (Germany). The settlement was founded in the 3rd century BC and existed until c. 50–30 BC. It reached its largest extent during the late La Tène period (late 2nd century BC), when it had a size of 380 hectares. At that time, 5,000 to 10,000 people lived within its 7.2 km long walls. The oppidum of
Bibracte Bibracte, a Gallic ''oppidum'' or fortified settlement, was the capital of the Aedui and one of the most important hillforts in Gaul. It was situated near modern Autun in Burgundy, France. The material culture of the Aedui corresponded to the ...
is another example of a Gaulish fortified settlement.


Bronze and Iron Age Near East


Ancient Rome

The Mura aureliane are a line of
city wall A defensive wall is a fortification usually used to protect a city, town or other settlement from potential aggressors. The walls can range from simple palisades or earthworks to extensive military fortifications with towers, bastions and gates ...
s built between 271 AD and 275 AD in
Rome , established_title = Founded , established_date = 753 BC , founder = King Romulus (legendary) , image_map = Map of comune of Rome (metropolitan city of Capital Rome, region Lazio, Italy).svg , map_caption ...
,
Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical ...
, during the reign of the Roman Emperors Aurelian and Probus. The walls enclosed all the
seven hills of Rome The seven hills of Rome ( la, Septem colles/montes Romae, it, Sette colli di Roma ) east of the river Tiber form the geographical heart of Rome, within the walls of the city. Hills The seven hills are: * Aventine Hill (Latin: ''Collis Aventi ...
plus the
Campus Martius The Campus Martius (Latin for the "Field of Mars", Italian ''Campo Marzio'') was a publicly owned area of ancient Rome about in extent. In the Middle Ages, it was the most populous area of Rome. The IV rione of Rome, Campo Marzio, which cove ...
and, on the right bank of the
Tiber The Tiber ( ; it, Tevere ; la, Tiberis) is the third-longest List of rivers of Italy, river in Italy and the longest in Central Italy, rising in the Apennine Mountains in Emilia-Romagna and flowing through Tuscany, Umbria, and Lazio, where ...
, the Trastevere district. The river banks within the city limits appear to have been left unfortified, although they were fortified along the Campus Martius. The full circuit ran for surrounding an area of . The walls were constructed in brick-faced concrete, thick and high, with a square tower every 100 Roman feet (). In the 5th century, remodelling doubled the height of the walls to . By 500 AD, the circuit possessed 383 towers, 7,020
crenellation A battlement in defensive architecture, such as that of city walls or castles, comprises a parapet (i.e., a defensive low wall between chest-height and head-height), in which gaps or indentations, which are often rectangular, occur at interva ...
s, 18 main gates, 5 postern gates, 116
latrine A latrine is a toilet or an even simpler facility that is used as a toilet within a sanitation system. For example, it can be a communal trench in the earth in a camp to be used as emergency sanitation, a hole in the ground ( pit latrine), or ...
s, and 2,066 large external windows.Claridge, Amanda (1998). ''Rome: An Oxford Archaeological Guide'', First, Oxford, UK: Oxford University Press, 1998, pp. 59, 332–335. The
Romans Roman or Romans most often refers to: *Rome, the capital city of Italy * Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of ancient Rome *''Epistle to the Romans'', shortened to ''Romans'', a lette ...
fortified their cities with massive, mortar-bound stone walls. The most famous of these are the largely extant Aurelian Walls of
Rome , established_title = Founded , established_date = 753 BC , founder = King Romulus (legendary) , image_map = Map of comune of Rome (metropolitan city of Capital Rome, region Lazio, Italy).svg , map_caption ...
and the
Theodosian Walls The Walls of Constantinople ( el, Τείχη της Κωνσταντινουπόλεως) are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul in Turkey) since its founding as the ...
of
Constantinople la, Constantinopolis ota, قسطنطينيه , alternate_name = Byzantion (earlier Greek name), Nova Roma ("New Rome"), Miklagard/Miklagarth (Old Norse), Tsargrad ( Slavic), Qustantiniya ( Arabic), Basileuousa ("Queen of Cities"), Megalopolis ( ...
, together with partial remains elsewhere. These are mostly city gates, like the Porta Nigra in
Trier Trier ( , ; lb, Tréier ), formerly known in English as Trèves ( ;) and Triers (see also names in other languages), is a city on the banks of the Moselle in Germany. It lies in a valley between low vine-covered hills of red sandstone in the ...
or
Newport Arch Newport Arch is a 3rd-century Roman gate in the city of Lincoln, Lincolnshire. It is a Scheduled monument and Grade I listed building and is reputedly the oldest arch in the United Kingdom still used by traffic. History The arch was remodelled ...
in
Lincoln Lincoln most commonly refers to: * Abraham Lincoln (1809–1865), the sixteenth president of the United States * Lincoln, England, cathedral city and county town of Lincolnshire, England * Lincoln, Nebraska, the capital of Nebraska, U.S. * Lincol ...
. Hadrian's Wall was built by the
Roman Empire The Roman Empire ( la, Imperium Romanum ; grc-gre, Βασιλεία τῶν Ῥωμαίων, Basileía tôn Rhōmaíōn) was the post- Republican period of ancient Rome. As a polity, it included large territorial holdings around the Mediter ...
across the width of what is now
northern England Northern England, also known as the North of England, the North Country, or simply the North, is the northern area of England. It broadly corresponds to the former borders of Angle Northumbria, the Anglo-Scandinavian Kingdom of Jorvik, and the ...
following a visit by Roman Emperor Hadrian (AD 76–138) in AD 122.


India

A number of forts dating from the Later Stone Age to the
British Raj The British Raj (; from Hindi ''rāj'': kingdom, realm, state, or empire) was the rule of the British Crown on the Indian subcontinent; * * it is also called Crown rule in India, * * * * or Direct rule in India, * Quote: "Mill, who was him ...
may be found in India. "Fort" is the word used in India for all old fortifications. Numerous Indus Valley Civilization sites exhibit evidences of fortifications. While
Dholavira Dholavira ( gu, ધોળાવીરા) is an archaeological site at Khadirbet in Bhachau Taluka of Kutch District, in the state of Gujarat in western India, which has taken its name from a modern-day village south of it. This village is ...
has stone-built fortification walls,
Harrapa Harappa (; Urdu/ pnb, ) is an archaeological site in Punjab, Pakistan, about west of Sahiwal. The Bronze Age Harappan civilisation, now more often called the Indus Valley Civilisation, is named after the site, which takes its name from a mode ...
is fortified using baked bricks; sites such as
Kalibangan Kalibangān is a town located at on the left or southern banks of the Ghaggar (Ghaggar-Hakra River) in Tehsil Pilibangān, between Suratgarh and Hanumangarh in Hanumangarh District, Rajasthan, India 205 km. from Bikaner. It is also identi ...
exhibit mudbrick fortifications with bastions and
Lothal Lothal () was one of the southernmost sites of the ancient Indus Valley civilisation, located in the Bhāl region of the modern state of Gujarāt. Construction of the city is believed to have begun around 2200 BCE. Archaeological Survey of ...
has a quadrangular fortified layout. Evidence also suggested of fortifications in
Mohenjo-daro Mohenjo-daro (; sd, موئن جو دڙو'', ''meaning 'Mound of the Dead Men';Kaushambi,
Mahasthangarh Mahasthangarh ( bn, মহাস্থানগড়, ''Môhasthangôṛ'') is one of the earliest urban archaeological sites so far discovered in Bangladesh. The village Mahasthan in Shibganj upazila of Bogra District contains the remain ...
,
Pataliputra Pataliputra ( IAST: ), adjacent to modern-day Patna, was a city in ancient India, originally built by Magadha ruler Ajatashatru in 490 BCE as a small fort () near the Ganges river.. Udayin laid the foundation of the city of Pataliputra at the ...
,
Mathura Mathura () is a city and the administrative headquarters of Mathura district in the Indian state of Uttar Pradesh. It is located approximately north of Agra, and south-east of Delhi; about from the town of Vrindavan, and from Govardhan. ...
,
Ahichchhatra Ahichchhatra ( sa, अहिच्छत्र, translit=Ahicchatra) or Ahikshetra ( sa, अहिक्षेत्र, translit=Ahikṣetra), near the modern Ramnagar village in Aonla tehsil, Bareilly district in Uttar Pradesh, India, was the ...
,
Rajgir Rajgir, meaning "The City of Kings," is a historic town in the district of Nalanda in Bihar, India. As the ancient seat and capital of the Haryanka dynasty, the Pradyota dynasty, the Brihadratha dynasty and the Mauryan Empire, as well as the d ...
, and Lauria Nandangarh. The earliest vedic brick fortification occurs in one of the stupa mounds of Lauria Nandangarh, which is 1.6 km in perimeter and oval in plan and encloses a habitation area. India currently has over 180 forts, with the state of Maharashtra alone having over 70 forts, which are also known as ''durg'', many of them built by
Shivaji Shivaji Bhonsale I (; 19 February 1630 – 3 April 1680), also referred to as Chhatrapati Shivaji Maharaj, was an Indian ruler and a member of the Bhonsle Maratha clan. Shivaji carved out his own independent kingdom from the declining Adil ...
, founder of the Maratha state. A large majority of forts in India are in North India. The most notable forts are the
Red Fort The Red Fort or Lal Qila () is a historic fort in Old Delhi, Delhi in India that served as the main residence of the Mughal Emperors. Emperor Shah Jahan commissioned construction of the Red Fort on 12 May 1638, when he decided to shift ...
at
Delhi Delhi, officially the National Capital Territory (NCT) of Delhi, is a city and a union territory of India containing New Delhi, the capital of India. Straddling the Yamuna river, primarily its western or right bank, Delhi shares borders ...
, the
Red Fort The Red Fort or Lal Qila () is a historic fort in Old Delhi, Delhi in India that served as the main residence of the Mughal Emperors. Emperor Shah Jahan commissioned construction of the Red Fort on 12 May 1638, when he decided to shift ...
at
Agra Agra (, ) is a city on the banks of the Yamuna river in the Indian state of Uttar Pradesh, about south-east of the national capital New Delhi and 330 km west of the state capital Lucknow. With a population of roughly 1.6 million, Agra i ...
, the
Chittor Fort The Chittorgarh (literally Chittor Fort), also known as Chittod Fort, is one of the largest forts in India. It is a UNESCO World Heritage Site. The fort was the capital of Mewar and is located in the present-day city of Chittorgarh. It sprawl ...
and
Mehrangarh Fort Mehrangarh Fort covers an area of 1,200 acres (486 hectares) in Jodhpur, Rajasthan, India. The complex is located on a hilltop around 122 metres above the surrounding plain, and was constructed by Rajput ruler Rao Jodha, though most of the ex ...
in
Rajasthan Rajasthan (; lit. 'Land of Kings') is a state in northern India. It covers or 10.4 per cent of India's total geographical area. It is the largest Indian state by area and the seventh largest by population. It is on India's northwestern s ...
, the Ranthambhor Fort,
Amer Fort Amer Fort or Amber Fort is a fort located in Amer, Rajasthan, India. Amer is a town with an area of located from Jaipur, the capital of Rajasthan. Amber city and Amber fort were founded by ruler Alan Singh of Chanda dynasty of Meenas. Located ...
and
Jaisalmer Fort Jaisalmer Fort is situated in the city of Jaisalmer, in the Indian state of Rajasthan. It is believed to be one of the very few "living forts" in the world (such as Carcassonne, France), as nearly one fourth of the old city's population still re ...
also in Rajasthan and
Gwalior Fort The Gwalior Fort commonly known as the ''Gwāliiyar Qila'', is a hill fort near Gwalior, Madhya Pradesh, India. The fort has existed at least since the 10th century, and the inscriptions and monuments found within what is now the fort campus in ...
in
Madhya Pradesh Madhya Pradesh (, ; meaning 'central province') is a state in central India. Its capital is Bhopal, and the largest city is Indore, with Jabalpur, Ujjain, Gwalior, Sagar, and Rewa being the other major cities. Madhya Pradesh is the seco ...
.


China

Large tempered earth (i.e.
rammed earth Rammed earth is a technique for constructing foundations, floors, and walls using compacted natural raw materials such as earth, chalk, lime, or gravel. It is an ancient method that has been revived recently as a sustainable building method. ...
) walls were built in ancient China since the
Shang dynasty The Shang dynasty (), also known as the Yin dynasty (), was a Chinese royal dynasty founded by Tang of Shang (Cheng Tang) that ruled in the Yellow River valley in the second millennium BC, traditionally succeeding the Xia dynasty and ...
(c. 1600–1050 BC); the capital at ancient Ao had enormous walls built in this fashion (see
siege A siege is a military blockade of a city, or fortress, with the intent of conquering by attrition, or a well-prepared assault. This derives from la, sedere, lit=to sit. Siege warfare is a form of constant, low-intensity conflict characteriz ...
for more info). Although stone walls were built in China during the
Warring States The Warring States period () was an era in ancient Chinese history characterized by warfare, as well as bureaucratic and military reforms and consolidation. It followed the Spring and Autumn period and concluded with the Qin wars of conquest ...
(481–221 BC), mass conversion to stone architecture did not begin in earnest until the
Tang dynasty The Tang dynasty (, ; zh, t= ), or Tang Empire, was an imperial dynasty of China that ruled from 618 to 907 AD, with an interregnum between 690 and 705. It was preceded by the Sui dynasty and followed by the Five Dynasties and Ten Kingdom ...
(618–907 AD). The
Great Wall of China The Great Wall of China (, literally "ten thousand ''li'' wall") is a series of fortifications that were built across the historical northern borders of ancient Chinese states and Imperial China as protection against various nomadic gro ...
had been built since the
Qin dynasty The Qin dynasty ( ; zh, c=秦朝, p=Qín cháo, w=), or Ch'in dynasty in Wade–Giles romanization ( zh, c=, p=, w=Ch'in ch'ao), was the first dynasty of Imperial China. Named for its heartland in Qin state (modern Gansu and Shaanxi), ...
(221–207 BC), although its present form was mostly an engineering feat and remodelling of the
Ming dynasty The Ming dynasty (), officially the Great Ming, was an imperial dynasty of China, ruling from 1368 to 1644 following the collapse of the Mongol-led Yuan dynasty. The Ming dynasty was the last orthodox dynasty of China ruled by the Han peo ...
(1368–1644 AD). In addition to the Great Wall, a number of Chinese cities also employed the use of defensive walls to defend their cities. Notable
Chinese city wall Chinese city walls () refer to defensive systems used to protect towns and cities in China in pre-modern times. In addition to walls, city defenses often included towers and gates. Meaning of the word ''Chengqiang'' The most specific Chines ...
s include the city walls of
Hangzhou Hangzhou ( or , ; , , Standard Mandarin pronunciation: ), also romanized as Hangchow, is the capital and most populous city of Zhejiang, China. It is located in the northwestern part of the province, sitting at the head of Hangzhou Bay, whic ...
,
Nanjing Nanjing (; , Mandarin pronunciation: ), alternately romanized as Nanking, is the capital of Jiangsu province of the People's Republic of China. It is a sub-provincial city, a megacity, and the second largest city in the East China region. T ...
, the
Old City of Shanghai The Old City of Shanghai (; Shanghainese: ''Zånhae Lo Zenshian''), also formerly known as the Chinese city, is the traditional urban core of Shanghai. Its boundary was formerly defined by a defensive wall. The Old City was the county seat for t ...
, Suzhou,
Xi'an Xi'an ( , ; ; Chinese: ), frequently spelled as Xian and also known by other names, is the capital of Shaanxi Province. A sub-provincial city on the Guanzhong Plain, the city is the third most populous city in Western China, after Chongqi ...
and the
walled villages of Hong Kong Most of the walled villages of Hong Kong are located in the New Territories. History During the Ming and Qing dynasties, the shore of Guangdong suffered from pirates, and the area of present-day Hong Kong was particularly vulnerable to p ...
. The famous walls of the
Forbidden City The Forbidden City () is a palace complex in Dongcheng District, Beijing, China, at the center of the Imperial City of Beijing. It is surrounded by numerous opulent imperial gardens and temples including the Zhongshan Park, the sacrifi ...
in
Beijing } Beijing ( ; ; ), alternatively romanized as Peking ( ), is the capital of the People's Republic of China. It is the center of power and development of the country. Beijing is the world's most populous national capital city, with over 21 ...
were established in the early 15th century by the
Yongle Emperor The Yongle Emperor (; pronounced ; 2 May 1360 – 12 August 1424), personal name Zhu Di (), was the third Emperor of the Ming dynasty, reigning from 1402 to 1424. Zhu Di was the fourth son of the Hongwu Emperor, the founder of the Ming dyn ...
. The Forbidden City made up the inner portion of the
Beijing city fortifications The Beijing city fortifications were Defensive wall, walls with series of towers and gates constructed in the city of Beijing, China in the early 1400s until they were partially demolished in 1965 for the construction of the 2nd Ring Road and Line ...
.


Philippines


Spanish colonial fortifications

During the
Spanish Era The Spanish era ( la, Æra Hispanica), sometimes called the era of Caesar, was a calendar era (year numbering system) commonly used in the states of the Iberian Peninsula from the 5th century until the 15th, when it was phased out in favour of the ...
several forts and outposts were built throughout the archipelago. Most notable is
Intramuros Intramuros (Latin for "inside the walls") is the historic walled area within the city of Manila, the capital of the Philippines. It is administered by the Intramuros Administration with the help of the city government of Manila. Present-day ...
, the old walled city of Manila located along the southern bank of the
Pasig River The Pasig River ( fil, Ilog Pasig) is a water body in the Philippines that connects Laguna de Bay to Manila Bay. Stretching for , it bisects the Philippine capital of Manila and its surrounding urban area into northern and southern halves. Its ...
. The historic city was home to centuries-old churches, schools, convents, government buildings and residences, the best collection of Spanish colonial architecture before much of it was destroyed by the bombs of
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposing ...
. Of all the buildings within the 67-acre city, only one building, the San Agustin Church, survived the war. Partial listing of Spanish forts: #
Intramuros Intramuros (Latin for "inside the walls") is the historic walled area within the city of Manila, the capital of the Philippines. It is administered by the Intramuros Administration with the help of the city government of Manila. Present-day ...
,
Manila Manila ( , ; fil, Maynila, ), officially the City of Manila ( fil, Lungsod ng Maynila, ), is the capital of the Philippines, and its second-most populous city. It is highly urbanized and, as of 2019, was the world's most densely populate ...
#
Cuartel de Santo Domingo Cuartel de Santo Domingo, also known as ''Fort Sto. Domingo ''and ''Intramuros of Sta. Rosa'', is an old two-storey Spanish barracks building in Santa Rosa, Laguna in the Philippines. It is currently used as the headquarters of the Special Action ...
,
Santa Rosa, Laguna Santa Rosa, officially the City of Santa Rosa ( fil, Lungsod ng Santa Rosa), is a 1st class Cities of the Philippines#Legal classification, component city in the Provinces of the Philippines, province of Laguna (province), Laguna, Philippines. ...
# Fuerza de Cuyo,
Cuyo, Palawan Cuyo, officially the Municipality of Cuyo ( cyo, Banwa 'ang Cuyo, tgl, Bayan ng Cuyo), is a 4th class municipality in the province of Palawan, Philippines. According to the 2020 census, it has a population of 23,489 people. Its territory incl ...
# Fuerza de Cagayancillo, Cagayancillo,
Palawan Palawan (), officially the Province of Palawan ( cyo, Probinsya i'ang Palawan; tl, Lalawigan ng Palawan), is an archipelagic province of the Philippines that is located in the region of Mimaropa. It is the largest province in the country in t ...
# Real Fuerza de Nuestra Señora del Pilar de Zaragoza,
Zamboanga City Zamboanga City, officially the City of Zamboanga (Chavacano and es, Ciudad de Zamboanga, Tausūg: ''Dāira sin Sambuangan'', fil, Lungsod ng Zamboanga, ceb, Dakbayan sa Zamboanga), is a city in the Zamboanga Peninsula region of the Philipp ...
# Fuerza de San Felipe,
Cavite City Cavite City, officially the City of Cavite ( fil, Lungsod ng Kabite, Spanish and cbk, Ciudad de Cavite), is a 4th class component city in the Philippines. According to the 2020 census, it has a population of 100,674 people. The city was the ...
# Fuerza de San Pedro,
Cebu Cebu (; ceb, Sugbo), officially the Province of Cebu ( ceb, Lalawigan sa Sugbo; tl, Lalawigan ng Cebu; hil, Kapuroan sang Sugbo), is a province of the Philippines located in the Central Visayas region, and consists of a main island and 16 ...
#
Fuerte dela Concepcion y del Triunfo The Fuerte de la Concepción y del Triunfo (Fort of the Conception and the Triumph), also known as Fuerte de Nuestra Señora de la Concepción del Triunfo (Fort of Our Lady of the Conception of Triumph), Fort of Misamis, and Triunfo Fort, is a cit ...
,
Ozamiz Ozamiz, officially the City of Ozamiz ( ceb, Dakbayan sa Ozamiz; fil, Lungsod ng Ozamiz), is a 3rd class component city in the province of Misamis Occidental, Philippines. According to the 2020 census, it has a population of 140,334 people. A ...
,
Misamis Occidental Misamis Occidental ( ceb, Kasadpang Misamis; Subanen: ''Sindepan Mis'samis''; fil, Kanlurang Misamis), officially the Province of Misamis Occidental, is a province located in the region of Northern Mindanao in the Philippines. Its capital is th ...
# Fuerza de San Antonio Abad,
Manila Manila ( , ; fil, Maynila, ), officially the City of Manila ( fil, Lungsod ng Maynila, ), is the capital of the Philippines, and its second-most populous city. It is highly urbanized and, as of 2019, was the world's most densely populate ...
# Fuerza de Pikit,
Pikit, Cotabato Pikit, officially the Municipality of Pikit ( Maguindanaon: ''Inged nu Pikit'', Jawi: ايڠايد نو ڤيكيت; Iranun: ''Inged a Pikit'', ايڠايد ا ڤيكيت; Hiligaynon: ''Banwa sang Pikit''; Cebuano: ''Lungsod sa Pikit''; Tagalo ...
# Fuerza de Santiago,
Romblon, Romblon Romblon, officially the Municipality of Romblon, is a 3rd class municipality and capital of the province of Romblon, Philippines. According to the 2020 census, it has a population of 40,554 people. The town comprises the entire Romblon Island, ...
# Fuerza de Jolo,
Jolo, Sulu , nickname = , motto = , anthem = , subdivision_type3 = District , subdivision_name3 = , established_title = Founded , established_date = 1952 , parts_ ...
# Fuerza de Masbate,
Masbate Masbate, officially the Province of Masbate ( Masbateño: ''Probinsya san Masbate''; tl, Lalawigan ng Masbate), is an island province in the Philippines located near the midsection of the nation's archipelago. Its provincial capital is Masbate C ...
# Fuerza de Bongabong,
Bongabong, Oriental Mindoro Bongabong, officially the Municipality of Bongabong ( tgl, Bayan ng Bongabong), is a 1st class municipality in the province of Oriental Mindoro, Philippines. According to the 2020 census, it has a population of 76,973 people. The town is home ...
# Cotta de Dapitan,
Dapitan Dapitan, officially the City of Dapitan ( ceb, Dakbayan sa Dapitan; Subanon: ''Gembagel G'benwa Dapitan/Bagbenwa Dapitan cbk, Ciudad de Dapitan''), is a 3rd class component city in the province of Zamboanga del Norte, Philippines. According to ...
,
Zamboanga del Norte Zamboanga del Norte ( Cebuano: ''Amihanang Zamboanga''; Subanon: ''Utara Sembwangan''; tl, Hilagang Zamboanga), officially the Province of Zamboanga del Norte, is a province in the Philippines situated within the Zamboanga Peninsula region in ...
# Fuerte de Alfonso XII,
Tukuran, Zamboanga del Sur Tukuran, officially the Municipality of Tukuran ( ceb, Lungsod sa Tukuran; Subanen: ''Benwa Tukuran''; Iranun: ''Inged a Tukudan''; Chavacano: ''Municipalidad de Tukuran''; tl, Bayan ng Tukuran), is a 4th class municipality in the province of Z ...
# Fuerza de Bacolod,
Bacolod, Lanao del Norte Bacolod, officially the Municipality of Bacolod (Maranao: ''Inged a Bacolod''; ceb, Lungsod sa Bacolod; tl, Bayan ng Bacolod), is a 4th class municipality in the province of Lanao del Norte, Philippines. According to the 2020 census, it has a pop ...
# Guinsiliban Watchtower,
Guinsiliban, Camiguin Guinsiliban, officially the Municipality of Guinsiliban, is a 6th class municipality in the province of Camiguin, Philippines. According to the 2020 census, it has a population of 6,685 people. Geography Barangays Guinsiliban is politically sub ...
# Laguindingan Watchtower,
Laguindingan, Misamis Oriental Laguindingan, officially the Municipality of Laguindingan ( ceb, Lungsod sa Laguindingan; tl, Bayan ng Laguindingan), is a 4th class municipality in the province of Misamis Oriental, Philippines. According to the 2020 census, it has a population ...
# Kutang San Diego,
Gumaca, Quezon Gumaca, officially the Municipality of Gumaca ( tgl, Bayan ng Gumaca), is a 1st class municipality in the province of Quezon, Philippines. According to the 2020 census, it has a population of 71,942 people. It is located at the mouth of what is ...
# Baluarte Luna,
Luna, La Union Luna, officially the Municipality of Luna ( ilo, Ili ti Luna; fil, Bayan ng Luna), is a 3rd class municipality in the province of La Union, Philippines. According to the 2020 census, it has a population of 37,318 people. Luna is from San Fern ...


Local fortifications

The Ivatan people of the northern islands of Batanes built their so-called ''
idjang Ijangs are the terraced and defended settlements on hill tops and ridges in the Batanes Islands in the Philippines. These high rocky formations can serve as fortress or refuge against attacking enemies for the Ivatan people. Background In 1994, E ...
'' on hills and elevated areas to protect themselves during times of war. These fortifications were likened to European castles because of their purpose. Usually, the only entrance to the castles would be via a rope ladder that would only be lowered for the villagers and could be kept away when invaders arrived. The
Igorots The indigenous peoples of the Cordillera Mountain Range of northern Luzon, Philippines are often referred to using the exonym Igorot people, or more recently, as the Cordilleran peoples. There are nine main ethnolinguistic groups whose domains ar ...
built forts made of stone walls that averaged several meters in width and about two to three times the width in height around 2000 BC.Ancient and Pre-Spanish Era of the Philippines
. Accessed September 04, 2008.
The Muslim Filipinos of the south built strong
fortresses A fortification is a military construction or building designed for the defense of territories in warfare, and is also used to establish rule in a region during peacetime. The term is derived from Latin ''fortis'' ("strong") and ''facere'' ...
called ''kota'' or ''moong'' to protect their communities. Usually, many of the occupants of these kotas are entire families rather than just warriors. Lords often had their own kotas to assert their right to rule, it served not only as a military installation but as a palace for the local Lord. It is said that at the height of the Maguindanao Sultanate's power, they blanketed the areas around Western
Mindanao Mindanao ( ) ( Jawi: مينداناو) is the second-largest island in the Philippines, after Luzon, and seventh-most populous island in the world. Located in the southern region of the archipelago, the island is part of an island group of ...
with Kotas and other fortifications to block the Spanish advance into the region. These kotas were usually made of stone and bamboo or other light materials and surrounded by trench networks. As a result, some of these kotas were burned easily or destroyed. With further Spanish campaigns in the region, the Sultanate was subdued and majority of Kotas dismantled or destroyed. Kotas were not only used by the Muslims as defense against Spaniards and other foreigners, renegades and rebels also built fortifications in defiance of other chiefs in the area. During the American occupation, rebels built strongholds and the Datus, Rajahs or Sultans often built and reinforced their kotas in a desperate bid to maintain rule over their subjects and their land. Many of these forts were also destroyed by American expeditions, as a result, very very few kotas still stand to this day. Notable Kotas: * Kota Selurong: an outpost of the
Bruneian Empire Bruneian may refer to: * Something of, or related to Brunei * A person from Brunei, or of Bruneian descent. For information about the Bruneian people, see Demographics of Brunei and Culture of Brunei. For specific Bruneians, see List of Bruneians. ...
in Luzon, later became the City of
Manila Manila ( , ; fil, Maynila, ), officially the City of Manila ( fil, Lungsod ng Maynila, ), is the capital of the Philippines, and its second-most populous city. It is highly urbanized and, as of 2019, was the world's most densely populate ...
. * Kuta Wato/Kota Bato: Literally translates to "stone fort" the first known stone fortification in the country, its ruins exist as the "Kutawato Cave Complex" * Kota Sug/Jolo: The capital and seat of the
Sultanate of Sulu The Sultanate of Sulu ( Tausūg: ''Kasultanan sin Sūg'', كاسولتانن سين سوڬ; Malay: ''Kesultanan Sulu''; fil, Sultanato ng Sulu; Chavacano: ''Sultanato de Sulu/Joló''; ar, سلطنة سولك) was a Muslim state that ruled ...
. When it was occupied by the Spaniards in the 1870s they converted the kota into the world's smallest walled city.


Pre-Islamic Arabia


During Muhammad's lifetime

During
Muhammad Muhammad ( ar, مُحَمَّد;  570 – 8 June 632 CE) was an Arab religious, social, and political leader and the founder of Islam. According to Islamic doctrine, he was a prophet divinely inspired to preach and confirm the mo ...
's era in Arabia, many tribes made use of fortifications. In the Battle of the Trench, the largely outnumbered defenders of Medina, mainly Muslims led by Islamic prophet Muhammad, dug a trench, which together with Medina's natural fortifications, rendered the confederate cavalry (consisting of horses and
camels A camel (from: la, camelus and grc-gre, κάμηλος (''kamēlos'') from Hebrew or Phoenician: גָמָל ''gāmāl''.) is an even-toed ungulate in the genus ''Camelus'' that bears distinctive fatty deposits known as "humps" on its back. ...
) useless, locking the two sides in a stalemate. Hoping to make several attacks at once, the confederates persuaded the Medina-allied
Banu Qurayza The Banu Qurayza ( ar, بنو قريظة, he, בני קוריט'ה; alternate spellings include Quraiza, Qurayzah, Quraytha, and the archaic Koreiza) were a Jewish tribe which lived in northern Arabia, at the oasis of Yathrib (now known as ...
to attack the city from the south. However, Muhammad's diplomacy derailed the negotiations, and broke up the confederacy against him. The well-organized defenders, the sinking of confederate morale, and poor weather conditions caused the siege to end in a fiasco.* During the
Siege of Ta'if The siege of Ta'if took place in 630, as the Muslims under the leadership of Muhammad besieged the city of Ta'if after their victory in the battles of Hunayn and Autas. One of the chieftains of Ta'if, Urwah ibn Mas'ud, was absent in Yemen d ...
in January 630, Note: Shawwal 8AH is January 630AD Muhammad ordered his followers to attack enemies who fled from the
Battle of Hunayn :''This is a sub-article to Muhammad after the conquest of Mecca.'' The Battle of Hunayn ( ar, غَزْوَة حُنَيْن, Ghazwat Hunayn) was between the Muslims of Muhammad and the Bedouins of the Qays, including its clans of Hawazi ...
and sought refuge in the fortress of Taif.


Islamic world


Africa

The
walls of Benin The Walls of Benin are a series of earthworks made up of banks and ditches, called ''ya'' in the Edo language, in the area around present-day Benin City, the capital of present-day Edo, Nigeria. They consist of of city iya and an estimated o ...
are described as the world's second longest man-made structure, as well as the most extensive earthwork in the world, by the ''Guinness Book of Records, 1974''. The walls may have been constructed between the thirteenth and mid-fifteenth century CE or, during the first millennium CE. Strong citadels were also built other in areas of Africa.
Yorubaland Yorubaland () is the homeland and cultural region of the Yoruba people in West Africa. It spans the modern-day countries of Nigeria, Togo and Benin, and covers a total land area of 142,114 km2 or about 60% of the land area of Ghana. Of this ...
for example had several sites surrounded by the full range of earthworks and ramparts seen elsewhere, and sited on ground. This improved defensive potential- such as hills and ridges. Yoruba fortifications were often protected with a double wall of trenches and ramparts, and in the Congo forests concealed
ditches A ditch is a small to moderate divot created to channel water. A ditch can be used for drainage, to drain water from low-lying areas, alongside roadways or fields, or to channel water from a more distant source for plant irrigation. Ditches ar ...
and paths, along with the main works, often bristled with rows of sharpened stakes. Inner defenses were laid out to blunt an enemy penetration with a maze of defensive walls allowing for entrapment and
crossfire A crossfire (also known as interlocking fire) is a military term for the siting of weapons (often automatic weapons such as assault rifles or sub-machine guns) so that their arcs of fire overlap. This tactic came to prominence in World War I. S ...
on opposing forces.July, pp. 11–39 A military tactic of the Ashanti was to create powerful log stockades at key points. This was employed in later wars against the
British British may refer to: Peoples, culture, and language * British people, nationals or natives of the United Kingdom, British Overseas Territories, and Crown Dependencies. ** Britishness, the British identity and common culture * British English, ...
to block British advances. Some of these fortifications were over a hundred yard long, with heavy parallel tree trunks. They were impervious to destruction by artillery fire. Behind these stockades numerous Ashanti soldiers were mobilized to check enemy movement. While formidable in construction, many of these strongpoints failed because Ashanti guns, gunpowder and bullets were poor, and provided little sustained killing power in defense. Time and time again British troops overcame or bypassed the stockades by mounting old-fashioned bayonet charges, after laying down some covering fire. Defensive works were of importance in the tropical African Kingdoms. In the Kingdom of Kongo field fortifications were characterized by trenches and low earthen embankments. Such strongpoints ironically, sometimes held up much better against European cannon than taller, more imposing structures.Thornton, pp. 22–39


Medieval Europe

Roman forts In the Roman Republic and the Roman Empire, the Latin word ''castrum'', plural ''castra'', was a military-related term. In Latin usage, the singular form ''castrum'' meant 'fort', while the plural form ''castra'' meant 'camp'. The singular and ...
and
hill fort A hillfort is a type of earthwork used as a fortified refuge or defended settlement, located to exploit a rise in elevation for defensive advantage. They are typically European and of the Bronze Age or Iron Age. Some were used in the post-Roma ...
s were the main antecedents of castles in
Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a subcontinent of Eurasia and it is located entirel ...
, which emerged in the 9th century in the
Carolingian Empire The Carolingian Empire (800–888) was a large Frankish-dominated empire in western and central Europe during the Early Middle Ages. It was ruled by the Carolingian dynasty, which had ruled as kings of the Franks since 751 and as kings of the ...
. The
Early Middle Ages The Early Middle Ages (or early medieval period), sometimes controversially referred to as the Dark Ages, is typically regarded by historians as lasting from the late 5th or early 6th century to the 10th century. They marked the start of the Mi ...
saw the creation of some towns built around castles. These cities were only rarely protected by simple stone walls and more usually by a combination of both walls and
ditches A ditch is a small to moderate divot created to channel water. A ditch can be used for drainage, to drain water from low-lying areas, alongside roadways or fields, or to channel water from a more distant source for plant irrigation. Ditches ar ...
. From the 12th century hundreds of settlements of all sizes were founded all across Europe, which very often obtained the right of fortification soon afterwards. The founding of urban centres was an important means of territorial expansion and many cities, especially in
eastern Europe Eastern Europe is a subregion of the European continent. As a largely ambiguous term, it has a wide range of geopolitical, geographical, ethnic, cultural, and socio-economic connotations. The vast majority of the region is covered by Russia, whic ...
, were founded precisely for this purpose during the period of Eastern Colonisation. These cities are easy to recognise due to their regular layout and large market spaces. The fortifications of these settlements were continuously improved to reflect the current level of military development. During the
Renaissance era The Renaissance ( , ) , from , with the same meanings. is a period in European history marking the transition from the Middle Ages to modernity and covering the 15th and 16th centuries, characterized by an effort to revive and surpass ideas ...
, the
Venetian Republic The Republic of Venice ( vec, Repùblega de Venèsia) or Venetian Republic ( vec, Repùblega Vèneta, links=no), traditionally known as La Serenissima ( en, Most Serene Republic of Venice, italics=yes; vec, Serenìsima Repùblega de Venèsia ...
raised great walls around cities, and the finest examples, among others, are in Nicosia (Cyprus),
Rocca di Manerba del Garda (Lombardy) The Rocca di Manerba del Garda (fortress of Manerba del Garda) is a rocky promontory, that extends along the south-western coast of Lake Garda, in Lombardy, Italy. The site, named after its medieval fortification period, is archaeologically si ...
and
Palmanova Palmanova ( fur, Palme) is a town and comune in northeast Italy. The town is an example of a star fort of the late Renaissance, built up by the Venetian Republic in 1593. The fortifications were included in UNESCO's World Heritage Site list as ...
(Italy), or
Dubrovnik Dubrovnik (), historically known as Ragusa (; see notes on naming), is a city on the Adriatic Sea in the region of Dalmatia, in the southeastern semi-exclave of Croatia. It is one of the most prominent tourist destinations in the Mediterran ...
(Croatia), which proved to be futile against attacks but still stand to this day. Unlike Venetians the Ottomans used to built smaller fortifications but in greater numbers, and only rarely fortified entire settlements such as Počitelj, Vratnik and Jajce in Bosnia.


Development after introduction of firearms

Medieval-style fortifications were largely made obsolete by the arrival of
cannon A cannon is a large- caliber gun classified as a type of artillery, which usually launches a projectile using explosive chemical propellant. Gunpowder ("black powder") was the primary propellant before the invention of smokeless powder ...
s on the 14th century
battle A battle is an occurrence of combat in warfare between opposing military units of any number or size. A war usually consists of multiple battles. In general, a battle is a military engagement that is well defined in duration, area, and force ...
field. Fortifications in the age of black powder evolved into much lower structures with greater use of
ditches A ditch is a small to moderate divot created to channel water. A ditch can be used for drainage, to drain water from low-lying areas, alongside roadways or fields, or to channel water from a more distant source for plant irrigation. Ditches ar ...
and
earth Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surfa ...
ramparts that would absorb and disperse the energy of cannon fire. Walls exposed to direct cannon fire were very vulnerable, so were sunk into ditches fronted by earth slopes. This placed a heavy emphasis on the
geometry Geometry (; ) is, with arithmetic, one of the oldest branches of mathematics. It is concerned with properties of space such as the distance, shape, size, and relative position of figures. A mathematician who works in the field of geometry is ...
of the fortification to allow defensive cannonry interlocking fields of fire to cover all approaches to the lower and thus more vulnerable walls. The evolution of this new style of fortification can be seen in transitional forts such as Sarzanello in North West Italy which was built between 1492 and 1502. Sarzanello consists of both crenellated walls with towers typical of the medieval period but also has a ravelin like angular gun platform screening one of the curtain walls which is protected from flanking fire from the towers of the main part of the fort. Another example are the
fortifications of Rhodes The fortifications of the town of Rhodes are shaped like a defensive crescent around the medieval town and consist mostly of a fortification composed of a huge wall made of an embankment encased in stone, equipped with scarp, bastions, moat, cou ...
which were ''frozen'' at 1522 so that Rhodes is the only European walled town that still shows the transition between the classical medieval fortification and the modern ones. Fortifications also extended in depth, with protected batteries for defensive cannonry, to allow them to engage attacking cannon to keep them at a distance and prevent them bearing directly on the vulnerable walls. The result was star shaped fortifications with tier upon tier of hornworks and bastions, of which
Fort Bourtange Fort Bourtange ( nl, Vesting Bourtange) is a fort in the village of Bourtange, Groningen, Netherlands. It was built under orders of William the Silent and completed in 1593. Its original purpose was to control the only road between Germany and the ...
is an excellent example. There are also extensive fortifications from this era in the Nordic states and in
Britain Britain most often refers to: * The United Kingdom, a sovereign state in Europe comprising the island of Great Britain, the north-eastern part of the island of Ireland and many smaller islands * Great Britain, the largest island in the United King ...
, the fortifications of
Berwick-upon-Tweed Berwick-upon-Tweed (), sometimes known as Berwick-on-Tweed or simply Berwick, is a town and civil parish in Northumberland, England, south of the Anglo-Scottish border, and the northernmost town in England. The 2011 United Kingdom census reco ...
and the harbour
archipelago An archipelago ( ), sometimes called an island group or island chain, is a chain, cluster, or collection of islands, or sometimes a sea containing a small number of scattered islands. Examples of archipelagos include: the Indonesian Arc ...
of Suomenlinna at
Helsinki Helsinki ( or ; ; sv, Helsingfors, ) is the capital, primate, and most populous city of Finland. Located on the shore of the Gulf of Finland, it is the seat of the region of Uusimaa in southern Finland, and has a population of . The city ...
being fine examples.


19th century

The arrival of
explosive shell A shell, in a military context, is a projectile whose payload contains an explosive, incendiary, or other chemical filling. Originally it was called a bombshell, but "shell" has come to be unambiguous in a military context. Modern usage ...
s in the 19th century led to yet another stage in the evolution of fortification. Star forts did not fare well against the effects of high explosive and the intricate arrangements of bastions, flanking batteries and the carefully constructed lines of fire for the defending cannon could be rapidly disrupted by explosive shells. Worse, the large open ditches surrounding forts of this type were an integral part of the defensive scheme, as was the covered way at the edge of the
counter scarp A scarp and a counterscarp are the inner and outer sides, respectively, of a ditch or moat used in fortifications. Attackers (if they have not bridged the ditch) must descend the counterscarp and ascend the scarp. In permanent fortifications th ...
. The ditch was extremely vulnerable to bombardment with explosive shells. In response, military engineers evolved the
polygonal In geometry, a polygon () is a plane figure that is described by a finite number of straight line segments connected to form a closed ''polygonal chain'' (or ''polygonal circuit''). The bounded plane region, the bounding circuit, or the two to ...
style of fortification. The ditch became deep and vertically sided, cut directly into the native rock or soil, laid out as a series of straight lines creating the central fortified area that gives this style of fortification its name. Wide enough to be an impassable barrier for attacking troops, but narrow enough to be a difficult target for enemy shellfire, the ditch was swept by fire from defensive
blockhouses A blockhouse is a small fortification, usually consisting of one or more rooms with loopholes, allowing its defenders to fire in various directions. It is usually an isolated fort in the form of a single building, serving as a defensive stro ...
set in the ditch as well as firing positions cut into the outer face of the ditch itself. The profile of the fort became very low indeed, surrounded outside the ditch covered by
caponiers A caponier is a type of defensive structure in a fortification. Fire from this point could cover the ditch beyond the curtain wall to deter any attempt to storm the wall. The word originates from the French ', meaning "chicken coop" (a ''capon'' ...
by a gently sloping open area so as to eliminate possible cover for enemy forces, while the fort itself provided a minimal target for enemy fire. The entrypoint became a sunken gatehouse in the inner face of the ditch, reached by a curving ramp that gave access to the gate via a rolling bridge that could be withdrawn into the gatehouse. Much of the fort moved underground. Deep passages and
tunnel A tunnel is an underground passageway, dug through surrounding soil, earth or rock, and enclosed except for the entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube cons ...
s now connected the blockhouses and firing points in the ditch to the fort proper, with
magazines A magazine is a periodical publication, generally published on a regular schedule (often weekly or monthly), containing a variety of content. They are generally financed by advertising, purchase price, prepaid subscriptions, or by a combination ...
and machine rooms deep under the surface. The guns, however, were often mounted in open emplacements and protected only by a
parapet A parapet is a barrier that is an extension of the wall at the edge of a roof, terrace, balcony, walkway or other structure. The word comes ultimately from the Italian ''parapetto'' (''parare'' 'to cover/defend' and ''petto'' 'chest/breast'). ...
; both in order to keep a lower profile and also because experience with guns in closed casemates had seen them put out of action by rubble as their own casemates were collapsed around them. Gone were citadels surrounding towns: forts were to be moved to the outside of the cities some 12 km to keep the enemy at a distance so their artillery could not bombard the city center. From now on a ring of forts were to be built at a spacing that would allow them to effectively cover the intervals between them. The new forts abandoned the principle of the bastion, which had also been made obsolete by advances in arms. The outline was a much simplified polygon, surrounded by a ditch. These forts, built in masonry and shaped stone, were designed to shelter their garrison against bombardment. One organizing feature of the new system involved the construction of two defensive curtains: an outer line of forts, backed by an inner ring or line at critical points of terrain or junctions (see, for example,
Séré de Rivières system The system was named after Raymond Adolphe Séré de Rivières, its originator. The system was an ensemble of fortifications built from 1874 along the frontiers and coasts of France. The fortresses were obsolescent by 1914 but were used during ...
in France). Traditional fortification however continued to be applied by European armies engaged in warfare in colonies established in Africa against lightly armed attackers from amongst the indigenous population. A relatively small number of defenders in a fort impervious to primitive weaponry could hold out against high odds, the only constraint being the supply of ammunition.


20th and 21st centuries

Steel-and-
concrete Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. Concrete is the second-most-used substance in the world after water, and is the most wid ...
fortifications were common during the 19th and early 20th centuries. However the advances in modern warfare since
World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
have made large-scale fortifications obsolete in most situations. In the 1930s and 1940s, some fortifications were built with designs taking into consideration the new threat of aerial warfare, for example
Fort Campbell Fort Campbell is a United States Army installation located astride the Kentucky–Tennessee border between Hopkinsville, Kentucky and Clarksville, Tennessee (post address is located in Kentucky). Fort Campbell is home to the 101st Airborne Divi ...
in Malta. Despite this, only underground
bunker A bunker is a defensive military fortification designed to protect people and valued materials from falling bombs, artillery, or other attacks. Bunkers are almost always underground, in contrast to blockhouses which are mostly above ground. T ...
s are still able to provide some protection in modern wars. Many historical fortifications were demolished during the modern age, but a considerable number survive as popular tourist destinations and prominent local landmarks today. The downfall of permanent fortifications had two causes: * The ever-escalating power, speed, and reach of artillery and air power meant that almost any target that could be located could be destroyed, if sufficient force were massed against it. As such, the more resources a defender devoted to reinforcing a fortification, the more combat power that fortification justified being devoted to destroying it, if the fortification's destruction was demanded by an attacker's strategy. From
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposing ...
,
bunker buster A bunker buster is a type of munition that is designed to penetrate hardened targets or targets buried deep underground, such as military bunkers. Armor piercing shells Germany Röchling shells were bunker-busting artillery shells, developed ...
s were used against fortifications. By 1950,
nuclear weapon A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission bomb) or a combination of fission and fusion reactions ( thermonuclear bomb), producing a nuclear explosion. Both bom ...
s were capable of destroying entire cities, and produced dangerous radiation. This led to the creation of civilian nuclear air raid shelters. * The second weakness of permanent fortification was its very permanency. Because of this it was often easier to go around a fortification and, with the rise of mobile warfare in the beginning of World War II, this became a viable offensive choice. When a defensive line was too extensive to be entirely bypassed, massive offensive might could be massed against one part of the line allowing a breakthrough, after which the rest of the line could be bypassed. Such was the fate of the many defensive lines built before and during World War II, such as the Siegfried Line, the Stalin Line and the Atlantic Wall. This was not the case with the Maginot Line; it was designed to force the Germans to invade other countries (Belgium or Switzerland) to go around it, and was successful in that sense. Instead field fortification rose to dominate defensive action. Unlike the
trench warfare Trench warfare is a type of land warfare using occupied lines largely comprising military trenches, in which troops are well-protected from the enemy's small arms fire and are substantially sheltered from artillery. Trench warfare became ar ...
which dominated World War I, these defences were more temporary in nature. This was an advantage because since it was less extensive it formed a less obvious target for enemy force to be directed against. If sufficient power were massed against one point to penetrate it, the forces based there could be withdrawn and the line could be re-established relatively quickly. Instead of a supposedly impenetrable defensive line, such fortifications emphasized
defence in depth Defence in depth (also known as deep defence or elastic defence) is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space. Rather than defeating ...
, so that as defenders were forced to pull back or were overrun, the lines of defenders behind them could take over the defence. Because the mobile offensives practised by both sides usually focused on avoiding the strongest points of a defensive line, these defences were usually relatively thin and spread along the length of a line. The defence was usually not equally strong throughout however. The strength of the defensive line in an area varied according to how rapidly an attacking force could progress in the terrain that was being defended—both the terrain the defensive line was built on and the ground behind it that an attacker might hope to break out into. This was both for reasons of the strategic value of the ground, and its defensive value. This was possible because while offensive tactics were focused on mobility, so were defensive tactics. The dug in defences consisted primarily of infantry and antitank guns. Defending tanks and tank destroyers would be concentrated in mobile
brigade A brigade is a major tactical military formation that typically comprises three to six battalions plus supporting elements. It is roughly equivalent to an enlarged or reinforced regiment. Two or more brigades may constitute a division. B ...
s behind the defensive line. If a major offensive was launched against a point in the line, mobile reinforcements would be sent to reinforce that part of the line that was in danger of failing. Thus the defensive line could be relatively thin because the bulk of the fighting power of the defenders was not concentrated in the line itself but rather in the mobile reserves. A notable exception to this rule was seen in the defensive lines at the
Battle of Kursk The Battle of Kursk was a major World War II Eastern Front engagement between the forces of Nazi Germany and the Soviet Union near Kursk in the southwestern USSR during late summer 1943; it ultimately became the largest tank battle in history ...
during World War II, where German forces deliberately attacked into the strongest part of the
Soviet The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen nation ...
defences seeking to crush them utterly. The
terrain Terrain or relief (also topographical relief) involves the vertical and horizontal dimensions of land surface. The term bathymetry is used to describe underwater relief, while hypsometry studies terrain relative to sea level. The Latin wo ...
that was being defended was of primary importance because
open terrain Open terrain, open country or open ground is terrain which is mostly flat and free of obstructions such as trees and buildings. Examples include farmland, grassland and specially cleared areas such as an airport. Such terrain is significant in ...
that tanks could move over quickly made possible rapid advances into the defenders' rear areas that were very dangerous to the defenders. Thus such terrain had to be defended at all cost. In addition, since in theory the defensive line only had to hold out long enough for mobile reserves to reinforce it, terrain that did not permit rapid advance could be held more weakly because the enemy's advance into it would be slower, giving the defenders more time to reinforce that point in the line. For example, the Battle of the Hurtgen Forest in Germany during the closing stages of World War II is an excellent example of how difficult terrain could be used to the defenders' advantage. After World War II, intercontinental ballistic missiles capable of reaching much of the way around the world were developed, and so speed became an essential characteristic of the strongest militaries and defenses.
Missile silo A missile launch facility, also known as an underground missile silo, launch facility (LF), or nuclear silo, is a vertical cylindrical structure constructed underground, for the storage and launching of intercontinental ballistic missiles (ICBMs ...
s were developed, so missiles could be fired from the middle of a country and hit cities and targets in another country, and airplanes (and air carriers) became major defenses and offensive weapons (leading to an expansion of the use of airports and airstrips as fortifications). Mobile defenses could be had underwater, too, in the form of
nuclear submarine A nuclear submarine is a submarine powered by a nuclear reactor, but not necessarily nuclear-armed. Nuclear submarines have considerable performance advantages over "conventional" (typically diesel-electric) submarines. Nuclear propulsion, ...
s capable of firing missiles. Some bunkers in the mid to late 20th century came to be buried deep inside mountains and prominent rocks, such as
Gibraltar ) , anthem = " God Save the King" , song = " Gibraltar Anthem" , image_map = Gibraltar location in Europe.svg , map_alt = Location of Gibraltar in Europe , map_caption = United Kingdom shown in pale green , mapsize = , image_map2 = Gib ...
and the
Cheyenne Mountain Complex The Cheyenne Mountain Complex is a Space Force installation and defensive bunker located in unincorporated El Paso County, Colorado, next to the city of Colorado Springs, at the Cheyenne Mountain Space Force Station, which hosts the activities o ...
. On the ground itself, minefields have been used as hidden defences in modern warfare, often remaining long after the wars that produced them have ended.
Demilitarized zone A demilitarized zone (DMZ or DZ) is an area in which treaties or agreements between nations, military powers or contending groups forbid military installations, activities, or personnel. A DZ often lies along an established frontier or bounda ...
s along borders are arguably another type of fortification, although a passive kind, providing a buffer between potentially hostile militaries.


Military airfields

Military airfields offer a fixed "target rich" environment for even relatively small enemy forces, using
hit-and-run tactics Hit-and-run tactics are a tactical doctrine of using short surprise attacks, withdrawing before the enemy can respond in force, and constantly maneuvering to avoid full engagement with the enemy. The purpose is not to decisively defeat the en ...
by ground forces, stand-off attacks (mortars and rockets), air attacks, or ballistic missiles. Key targets – aircraft, munitions, fuel, and vital technical personnel – can be protected by fortifications. Aircraft can be protected by revetments,
Hesco barrier The Concertainer, known colloquially as the HESCO MIL, Hesco barrier, or Hesco bastion, is a modern gabion primarily used for flood control and military fortifications. It is made of a collapsible wire mesh container and heavy duty fabric liner, ...
s, or hardened aircraft shelters which will protect from many types of attack. Larger aircraft types tend to be based outside the operational theatre. Munition storage follows safety rules which use fortifications (bunkers and bunds) to provide protection against accident and chain reactions (sympathetic detonations). Weapons for rearming aircraft can be stored in small fortified ''expense'' stores closer to the aircraft. At Bien Hoa South Vietnam on the morning of 16 May 1965, as aircraft were being re-fuelled and armed, a chain reaction explosion destroyed 13 aircraft, killed 34 personnel, and injured over 100; this, along with damage and losses of aircraft to enemy attack (by both infiltration and stand off attacks), led to the construction of revetments and shelters to protect aircraft throughout South Vietnam. Aircrew and ground personnel will need protection during enemy attacks and fortifications range from culvert section "duck and cover" shelters to permanent air-raid shelters. Soft locations with high personnel densities such as accommodation and messing facilities can have limited protection by placing prefabricated concrete walls or barriers around them, examples of barriers are Jersey Barriers, T Barriers or Splinter Protection Units (SPUs). Older fortification may prove useful such as the old 'Yugo' pyramid shelters built in the 1980s which were used by US personnel on 8 Jan 2020 when Iran fired 11 ballistic missiles at Ayn al-Asad Airbase in Iraq. Fuel is volatile and has to comply with rules for storage which provide protection against accident. Fuel in underground bulk fuel installations is well protected though valves and controls are vulnerable to enemy action. Above ground tanks can be susceptible to attack. Ground support equipment will need to be protected by fortifications to be usable after an enemy attack. Permanent (concrete) guard fortifications are safer, stronger, last longer and are more cost effective than sandbag fortifications. Prefabricated positions can be made from concrete culvert sections. The British Yarnold Bunker is made from sections of a concrete pipe. Guard Towers provide increased field of view but a lower level of protection. Dispersal and camouflage of assets can supplement fortifications against some forms of airfield attack.


Counter-insurgency

Just as in colonial periods, comparatively obsolete fortifications are still used for low-intensity conflicts. Such fortifications range in size from small patrol bases or
forward operating base A forward operating base (FOB) is any secured forward operational level military position, commonly a military base, that is used to support strategic goals and tactical objectives. A FOB may or may not contain an airfield, hospital, machine ...
s up to huge airbases such as Camp Bastion/
Leatherneck Leatherneck is a military slang term in the USA for a member of the United States Marine Corps. It is generally believed to originate in the wearing of a "leather stock" that went around the neck. Its original purpose was to protect the neck fr ...
in
Afghanistan Afghanistan, officially the Islamic Emirate of Afghanistan,; prs, امارت اسلامی افغانستان is a landlocked country located at the crossroads of Central Asia and South Asia. Referred to as the Heart of Asia, it is bordere ...
. Much like in the 18th and 19th century, because the enemy is not a powerful military force with the heavy weaponry required to destroy fortifications, walls of
gabion A gabion (from Italian ''gabbione'' meaning "big cage"; from Italian ''gabbia'' and Latin ''cavea'' meaning "cage") is a cage, cylinder or box filled with rocks, concrete, or sometimes sand and soil for use in civil engineering, road buildin ...
,
sandbag A sandbag or dirtbag is a bag or sack made of hessian (burlap), polypropylene or other sturdy materials that is filled with sand or soil and used for such purposes as flood control, military fortification in trenches and bunkers, shielding gl ...
or even simple mud can provide protection against small arms and anti-tank weapons – although such fortifications are still vulnerable to mortar and artillery fire.


Forts

Forts in modern American usage often refer to space set aside by governments for a permanent military facility; these often do not have any actual fortifications, and can have specializations (military barracks, administration, medical facilities, or intelligence). However, there are some modern fortifications that are referred to as forts. These are typically small semi permanent fortifications. In urban combat they are built by upgrading existing structures such as houses or public buildings. In field warfare they are often log, sandbag or
gabion A gabion (from Italian ''gabbione'' meaning "big cage"; from Italian ''gabbia'' and Latin ''cavea'' meaning "cage") is a cage, cylinder or box filled with rocks, concrete, or sometimes sand and soil for use in civil engineering, road buildin ...
type construction. Such forts are typically only used in low level conflict, such as counterinsurgency conflicts or very low level conventional conflicts, such as the Indonesia–Malaysia confrontation, which saw the use of log forts for use by forward
platoon A platoon is a military unit typically composed of two or more squads, sections, or patrols. Platoon organization varies depending on the country and the branch, but a platoon can be composed of 50 people, although specific platoons may rang ...
s and
companies A company, abbreviated as co., is a legal entity representing an association of people, whether natural, legal or a mixture of both, with a specific objective. Company members share a common purpose and unite to achieve specific, declared go ...
. The reason for this is that static above ground forts can not survive modern direct or indirect fire weapons larger than mortars, RPGs and small arms.


Prisons and others

Fortifications designed to keep the inhabitants of a facility in rather than attacker out can also be found, in prisons,
concentration camps Internment is the imprisonment of people, commonly in large groups, without charges or intent to file charges. The term is especially used for the confinement "of enemy citizens in wartime or of terrorism suspects". Thus, while it can simply ...
, and other such facilities, with supermaxes having some of the strongest of those. Those are covered in other articles, as most prisons and concentration camps are not primarily military forts (although forts, camps, and garrison towns have been used as prisons and/or concentration camps; such as
Theresienstadt Theresienstadt Ghetto was established by the SS during World War II in the fortress town of Terezín, in the Protectorate of Bohemia and Moravia ( German-occupied Czechoslovakia). Theresienstadt served as a waystation to the extermination ca ...
, Guantanamo Bay detention camp and the
Tower of London The Tower of London, officially His Majesty's Royal Palace and Fortress of the Tower of London, is a historic castle on the north bank of the River Thames in central London. It lies within the London Borough of Tower Hamlets, which is sep ...
for example).


See also

*
Border barrier A border barrier is a separation barrier that runs along or near an international border. Such barriers are typically constructed for border control purposes such as curbing illegal immigration, human trafficking, and smuggling. Some such barr ...
* Castra *
Citadel A citadel is the core fortified area of a town or city. It may be a castle, fortress, or fortified center. The term is a diminutive of "city", meaning "little city", because it is a smaller part of the city of which it is the defensive core. I ...
*
Coastal defence and fortification 300px, Castillo San Felipe de Barajas in Cartagena de Indias, Colombia, an example of an Early Modern coastal defense Coastal defence (or defense) and coastal fortification are measures taken to provide protection against military attack at or ...
*
Defense line A defense line or fortification line is a geographically-recognizable line of troops and armament, fortified and set up to protect a high-value location or defend territory. A defense line may be based on natural difficult terrain features, su ...
* Defensive wall *
Hesco bastion The Concertainer, known colloquially as the HESCO MIL, Hesco barrier, or Hesco bastion, is a modern gabion primarily used for flood control and military fortifications. It is made of a collapsible wire mesh container and heavy duty fabric liner, ...
*
Imperial fortress Imperial fortress was the designation given in the British Empire to four colonies that were located in strategic positions from each of which Royal Navy squadrons could control the surrounding regions and, between them, much of the planet. His ...
*
Kuruwa is a Japanese term for the walls of a Japanese castle are fortresses constructed primarily of wood and stone. They evolved from the wooden stockades of earlier centuries, and came into their best-known form in the 16th century. Castles in Jap ...
, walls of a Japanese castle *
List of fortifications This is a list of fortifications past and present, a fortification being a major physical defensive structure often composed of a more or less wall-connected series of forts. Individual fortifications ''listed by name'' *A Famosa, built in the 1 ...
*
List of forts This is a list for articles on notable historic forts which may or may not be under current active use by a military. There are also many towns named after a Fort, the largest being Fort Worth, Texas, United States. Antigua and Barbuda * Fort ...
*
Military camp A military camp or bivouac is a semi-permanent military base, for the lodging of an army. Camps are erected when a military force travels away from a major installation or fort during training or operations, and often have the form of large cam ...
*
Slighting Slighting is the deliberate damage of high-status buildings to reduce their value as military, administrative or social structures. This destruction of property sometimes extended to the contents of buildings and the surrounding landscape. It is ...
Fort components *
Abatis An abatis, abattis, or abbattis is a field fortification consisting of an obstacle formed (in the modern era) of the branches of trees laid in a row, with the sharpened tops directed outwards, towards the enemy. The trees are usually interlaced ...
*
Banquette A banquette is a small footpath or elevated step along the inside of a rampart or parapet of a fortification. Musketeers atop it were able to view the counterscarp A scarp and a counterscarp are the inner and outer sides, respectively, of a ...
* Barbed wire,
razor wire Barbed tape or razor wire is a mesh of metal strips with sharp edges whose purpose is to prevent passage by humans. The term "razor wire", through long usage, has generally been used to describe barbed tape products. Razor wire is much sharper th ...
,
wire entanglement In the military science of fortification, wire obstacles are defensive obstacles made from barbed wire, barbed tape or concertina wire. They are designed to disrupt, delay and generally slow down an attacking enemy. During the time that the at ...
, and
wire obstacle In the military science of fortification, wire obstacles are defensive obstacles made from barbed wire, barbed tape or concertina wire. They are designed to disrupt, delay and generally slow down an attacking enemy. During the time that the at ...
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Bartizan A bartizan (an alteration of ''bratticing''), also called a guerite, ''garita'', or ''échauguette'', or spelled bartisan, is an overhanging, wall-mounted turret projecting from the walls of late medieval and early-modern fortifications from th ...
* Bastion *
Berm A berm is a level space, shelf, or raised barrier (usually made of compacted soil) separating areas in a vertical way, especially partway up a long slope. It can serve as a terrace road, track, path, a fortification line, a border/ separation ...
* Capital *
Caponier A caponier is a type of defensive structure in a fortification. Fire from this point could cover the ditch beyond the curtain wall to deter any attempt to storm the wall. The word originates from the French ', meaning "chicken coop" (a ''capon'' ...
* Casemate *
Castle walls A curtain wall is a defensive wall between two fortified towers or bastions of a castle, fortress, or town. Ancient fortifications Evidence for curtain walls or a series of walls surrounding a town or fortress can be found in the historica ...
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Czech hedgehog The Czech hedgehog ( cs, rozsocháč or ') is a static anti-tank obstacle defense made of metal angle beams or I-beams (that is, lengths with an L- or Ɪ-shaped cross section). The hedgehog is very effective in keeping light to medium tanks and ...
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Defensive fighting position A defensive fighting position (DFP) is a type of earthwork constructed in a military context, generally large enough to accommodate anything from one soldier to a fire team (or similar sized unit). Terminology Tobruk type positions are nam ...
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Ditch A ditch is a small to moderate divot created to channel water. A ditch can be used for drainage, to drain water from low-lying areas, alongside roadways or fields, or to channel water from a more distant source for plant irrigation. Ditches ar ...
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Embrasure An embrasure (or crenel or crenelle; sometimes called gunhole in the domain of gunpowder-era architecture) is the opening in a battlement between two raised solid portions (merlons). Alternatively, an embrasure can be a space hollowed out ...
* Glacis *
Gun turret A gun turret (or simply turret) is a mounting platform from which weapons can be fired that affords protection, visibility and ability to turn and aim. A modern gun turret is generally a rotatable weapon mount that houses the crew or mechani ...
* Keep * Lunette * Machicolation * Outwork * Palisade *
Parapet A parapet is a barrier that is an extension of the wall at the edge of a roof, terrace, balcony, walkway or other structure. The word comes ultimately from the Italian ''parapetto'' (''parare'' 'to cover/defend' and ''petto'' 'chest/breast'). ...
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Pillbox Pillbox may refer to: * Pill organizer, a container for medicine * Pillbox hat, a woman's hat with a flat crown, straight upright sides, and no brim * Pillbox (military) A pillbox is a type of blockhouse, or concrete dug-in guard-post, norm ...
*
Postern A postern is a secondary door or gate in a fortification such as a city wall or castle curtain wall. Posterns were often located in a concealed location which allowed the occupants to come and go inconspicuously. In the event of a siege, a postern ...
* Ravelin *
Rampart Rampart may refer to: * Rampart (fortification), a defensive wall or bank around a castle, fort or settlement Rampart may also refer to: * "O'er the Ramparts We Watched" is a key line from "The Star-Spangled Banner", the national anthem of the ...
* Revetment *
Sandbag A sandbag or dirtbag is a bag or sack made of hessian (burlap), polypropylene or other sturdy materials that is filled with sand or soil and used for such purposes as flood control, military fortification in trenches and bunkers, shielding gl ...
* Sangar * Scarp and Counterscarp *
Turret Turret may refer to: * Turret (architecture), a small tower that projects above the wall of a building * Gun turret, a mechanism of a projectile-firing weapon * Objective turret, an indexable holder of multiple lenses in an optical microscope * Mi ...
* ''
Zwinger "" () is a German word for outer ward or outer bailey. It represents an open kill zone area between two defensive walls that is used for defensive purposes. s were built in the post-classical and early modern periods to improve the defence ...
'' Types of forts and fortification * Bastion fort (or star fort) * Blockhouse *
Bunker A bunker is a defensive military fortification designed to protect people and valued materials from falling bombs, artillery, or other attacks. Bunkers are almost always underground, in contrast to blockhouses which are mostly above ground. T ...
* Castle *
Chinese city wall Chinese city walls () refer to defensive systems used to protect towns and cities in China in pre-modern times. In addition to walls, city defenses often included towers and gates. Meaning of the word ''Chengqiang'' The most specific Chines ...
*
Compound Compound may refer to: Architecture and built environments * Compound (enclosure), a cluster of buildings having a shared purpose, usually inside a fence or wall ** Compound (fortification), a version of the above fortified with defensive struc ...
* Defensive wall *
Diaolou Diaolou () are fortified multi-storey watchtowers in rural villages, generally made of reinforced concrete. These towers are located mainly in the Kaiping () county of Jiangmen prefecture in Guangdong province, China. In 2007, UNESCO designated t ...
*
Fire support base A fire support base (FSB, firebase or FB) is a temporary military encampment to provide artillery fire support to infantry operating in areas beyond the normal range of fire support from their own base camps. FSBs follow a number of plans, their ...
*
Flak tower Flak towers (german: link=no, Flaktürme) were large, above-ground, anti-aircraft gun blockhouse towers constructed by Nazi Germany. There were 8 flak tower complexes in the cities of Berlin (three), Hamburg (two), and Vienna (three) from 1940 on ...
*
Fortress church A fortress church (german: Kirchenburg) is a particular type of church that, in addition to its religious functions is also used by the local population as a retreat and defensive position, similar to a refuge castle. A fortress church usually imp ...
or
fortified church A fortified church is a church that is built to serve a defensive role in times of war. Such churches were specially designed to incorporate military features, such as thick walls, battlements, and embrasures. Others, such as the Ávila Cathedra ...
* Grad, a Slavic wooden fortified settlement * Gusuku, fortifications in the Ryukyu Islands *
Korean fortress Korean fortresses are fortifications constructed by Koreans since the Three Kingdoms of Korea period. Koreans developed a unique and distinct fortress tradition. Korea, beginning with Goguryeo, has been called "a country of fortresses"; almost 2, ...
*
Hill fort A hillfort is a type of earthwork used as a fortified refuge or defended settlement, located to exploit a rise in elevation for defensive advantage. They are typically European and of the Bronze Age or Iron Age. Some were used in the post-Roma ...
*
Land battery Coastal artillery is the branch of the armed forces concerned with operating anti-ship artillery or fixed gun batteries in coastal fortifications. From the Middle Ages until World War II, coastal artillery and naval artillery in the form of ...
*
Martello tower Martello towers, sometimes known simply as Martellos, are small defensive forts that were built across the British Empire during the 19th century, from the time of the French Revolutionary Wars onwards. Most were coastal forts. They stand u ...
*
Medieval fortification Medieval fortification refers to medieval military methods that cover the development of fortification construction and use in Europe, roughly from the fall of the Western Roman Empire to the Renaissance. During this millennium, fortifications ...
*
Missile launch facility A missile launch facility, also known as an underground missile silo, launch facility (LF), or nuclear silo, is a vertical cylindrical structure constructed underground, for the storage and launching of intercontinental ballistic missiles (ICBMs ...
* , a 19th-century Māori fortification * Peel tower *
Polygonal fort A polygonal fort is a type of fortification originating in France in the late 18th century and fully developed in Germany in the first half of the 19th century. Unlike earlier forts, polygonal forts had no bastions, which had proved to be vulnerabl ...
* Promontory fort *
Redoubt A redoubt (historically redout) is a fort or fort system usually consisting of an enclosed defensive emplacement outside a larger fort, usually relying on earthworks, although some are constructed of stone or brick. It is meant to protect soldi ...
* Stockade Fortification and siege warfare *
Medieval warfare Medieval warfare is the warfare of the Middle Ages. Technological, cultural, and social advancements had forced a severe transformation in the character of warfare from antiquity, changing military tactics and the role of cavalry and artillery ( ...
* Military engineering * Military history *
Siege A siege is a military blockade of a city, or fortress, with the intent of conquering by attrition, or a well-prepared assault. This derives from la, sedere, lit=to sit. Siege warfare is a form of constant, low-intensity conflict characteriz ...
*
Siege engine A siege engine is a device that is designed to break or circumvent heavy castle doors, thick city walls and other fortifications in siege warfare. Some are immobile, constructed in place to attack enemy fortifications from a distance, while oth ...
Notable experts *
Henri Alexis Brialmont Henri-Alexis Brialmont (Venlo, 25 May 1821 – Brussels, 21 July 1903), nicknamed The Belgian Vauban after the French military architect, was a Belgian army officer, politician and writer of the 19th century, best known as a military archi ...
* César Cui *
Bernard de Gomme Bernard ('' Bernhard'') is a French and West Germanic masculine given name. It is also a surname. The name is attested from at least the 9th century. West Germanic ''Bernhard'' is composed from the two elements ''bern'' "bear" and ''hard'' "brav ...
*
Francesco Laparelli Francesco Laparelli da Cortona (5 April 1521 – 20 October 1570) was an Italian architect. He was an assistant of Michelangelo, and later was sent by the Pope to supervise the construction of Valletta in Malta. Early career Laparelli was bor ...
* Mozi *
Diades of Pella Diades of Pella ( grc, Διάδης Πελλαίος ''Diadis Pelleos''), surnamed the "Besieger" ( ''Poliorkitis''), was a Thessalian inventor of many siege engines, student of Philip II's military engineer Polyidus of Thessaly. He lived in the 4 ...
*
James of Saint George Master James of Saint George (–1309; French: , Old French: Mestre Jaks, Latin: Magister Jacobus de Sancto Georgio) was a master of works/architect from Savoy, described by historian Marc Morris as "one of the greatest architects of the Europea ...
*
Fritz Todt Fritz Todt (; 4 September 1891 – 8 February 1942) was a German construction engineer and senior Nazi who rose from the position of Inspector General for German Roadways, in which he directed the construction of the German autobahns (''Reichsa ...
*
Menno van Coehoorn Menno, Baron van Coehoorn (; March 1641 – 17 March 1704) was a Dutch soldier and engineer, regarded as one of the most significant figures in Dutch military history. In an era when siege warfare dominated military campaigns, he and his French ...
* Sébastien Le Prestre de Vauban *
Maximilian von Welsch Johann Maximilian von Welsch (1671 – 15 October 1745) was a German architect, construction director and fortress master builder. Life Maximilian von Welsch is regarded as a prominent representative of baroque fortress building in the Holy Roman ...


Notes


References

*


Bibliography

* July, Robert ''Pre-Colonial Africa'', Charles Scribner, 1975 * Murray, Nicholas. "The Development of Fortifications," ''The Encyclopedia of War'', Gordon Martel (ed.). WileyBlackwell, 2011. * Murray, Nicholas. ''The Rocky Road to the Great War: The Evolution of Trench Warfare to 1914''. Potomac Books Inc. (an imprint of the University of Nebraska Press), 2013. * Osadolor, Osarhieme Benson, "The Military System of Benin Kingdom 1440–1897", (UD), Hamburg University: 200
copy
* Thornton, John Kelly ''Warfare in Atlantic Africa'', 1500–1800, Routledge: 1999


External links


Fortress Study Group
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ICOFORT
{{Authority control Military strategy Military installations Forts