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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 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 Press 2009 and com ...
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 fun ...
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 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 have often been necessary for cities to survive in an ever-changing world of invasion and conquest. Some settlements in the
Indus Valley civilization The Indus Valley Civilisation (IVC), also known as the Indus Civilisation was a Bronze Age civilisation in the northwestern regions of South Asia, lasting from 3300 BCE to 1300 BCE, and in its mature form 2600 BCE to 1900&n ...
were the first small cities to be fortified. In
ancient Greece Ancient Greece ( el, Ἑλλάς, Hellás) was a northeastern Mediterranean civilization, existing from the Greek Dark Ages of the 12th–9th centuries BC to the end of classical antiquity ( AD 600), that comprised a loose collection of cult ...
, large stone walls had been built in
Mycenaean Greece Mycenaean Greece (or the Mycenaean civilization) was the last phase of the 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 ...
, 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. Th ...
(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 A garrison (from the French ''garnison'', itself from the verb ''garnir'', "to equip") is any body of troops stationed in a particular location, originally to guard it. The term now often applies to certain facilities that constitute a mil ...
, 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 letter ...
castellum A ''castellum'' in Latin is usually: * a small Roman fortlet or tower,C. Julius Caesar, Gallic War; 2,30 a diminutive of ('military camp'), often used as a watchtower or signal station like on Hadrian's Wall. It should be distinguished from a ...
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 of ...
s. Fortification is usually divided into two branches: permanent fortification and field fortification. There is also an intermediate branch known as semi-permanent fortification.
Castle A castle is a type of fortified structure built during the Middle Ages predominantly by the nobility or royalty and by military orders. Scholars debate the scope of the word ''castle'', but usually consider it to be the private fortified r ...
s 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. Life tenure, for life or until abdication, and therefore the head of state of a monarchy. A monarch may exercise the highest authority ...
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, Great B ...
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 Continent#Subcontinents, subcontinent of Eurasia ...
, 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 Lom ...
. 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 Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder, is the earliest known chemical explosive. It consists of a mixture of sulfur, carbon (in the form of charcoal) and potassium nitrate (saltpeter). Th ...
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 so ...
s in the 19th century led to yet another stage in the evolution of fortification.
Star fort A bastion fort or ''trace italienne'' (a phrase derived from non-standard French, literally meaning ''Italian outline'') is a fortification in a style that evolved during the early modern period of gunpowder when the cannon came to domin ...
s 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 Steel is an alloy made up of iron with added carbon to improve its strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistant ty ...
-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 wi ...
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 Obsolescence is the state of being which occurs when an object, service, or practice is no longer maintained or required even though it may still be in good working order. It usually happens when something that is more efficient or less risky r ...
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 ''
castra 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 ...
metation'' 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 of ...
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 warfare, attrition, or a well-prepared assault. This derives from la, sedere, lit=to sit. Siege warfare is a form of constant, low-intensity con ...
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 characterized ...
'' 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 characterized ...
''. 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 or ...
—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, wi ...
, 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 F ...
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.
Castle A castle is a type of fortified structure built during the Middle Ages predominantly by the nobility or royalty and by military orders. Scholars debate the scope of the word ''castle'', but usually consider it to be the private fortified r ...
s 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. Life tenure, for life or until abdication, and therefore the head of state of a monarchy. A monarch may exercise the highest authority ...
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, Great B ...
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 ...
.


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 o ...
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 administ ...
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 Sumer () is the earliest known civilization in the historical region of southern Mesopotamia (south-central Iraq), emerging during the Chalcolithic and early Bronze Ages between the sixth and fifth millennium BC. It is one of the cradles of c ...
(
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 F ...
) 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 The Nile, , Bohairic , lg, Kiira , Nobiin: Áman Dawū is a major north-flowing river in northeastern Africa. It flows into the Mediterranean Sea. The Nile is the longest river in Africa and has historically been considered the longest rive ...
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 provide ...
3200 BC in
Scotland Scotland (, ) is a country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a border with England to the southeast and is otherwise surrounded by the Atlantic Ocean to the ...
. 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 The Indus Valley Civilisation (IVC), also known as the Indus Civilisation was a Bronze Age civilisation in the northwestern regions of South Asia, lasting from 3300 BCE to 1300 BCE, and in its mature form 2600 BCE to 1900&n ...
were also fortified. By about 3500 BC, hundreds of small farming villages dotted the
Indus The Indus ( ) is a transboundary river of Asia and a trans-Himalayan river of South and Central Asia. The river rises in mountain springs northeast of Mount Kailash in Western Tibet, flows northwest through the disputed region of Kashmir, ...
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 Afghanistan, officially the Islamic Emirate of Afghanistan,; prs, امارت اسلامی افغانستان is a landlocked country located at ...
(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
bastion A bastion or bulwark is a structure projecting outward from the curtain wall of a fortification, most commonly angular in shape and positioned at the corners of the fort. The fully developed bastion consists of two faces and two flanks, with fi ...
s 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, in ...
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 pri ...
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 ''Bābili(m)'' * sux, 𒆍𒀭𒊏𒆠 * arc, 𐡁𐡁𐡋 ''Bāḇel'' * syc, ܒܒܠ ''Bāḇel'' * grc-gre, Βαβυλών ''Babylṓn'' * he, בָּבֶל ''Bāvel'' * peo, 𐎲𐎠𐎲𐎡𐎽𐎢 ''Bābiru'' * elx, 𒀸𒁀𒉿𒇷 ''Babi ...
was one of the most famous cities of the ancient world, especially as a result of the building program of
Nebuchadnezzar Nebuchadnezzar II (Babylonian cuneiform: ''Nabû-kudurri-uṣur'', meaning "Nabu, watch over my heir"; Biblical Hebrew: ''Nəḇūḵaḏneʾṣṣar''), also spelled Nebuchadrezzar II, was the second king of the Neo-Babylonian Empire, ruling ...
, 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 part ...
. 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 civilization, existing from the Greek Dark Ages of the 12th–9th centuries BC to the end of classical antiquity ( AD 600), that comprised a loose collection of cult ...
, large stone walls had been built in
Mycenaean Greece Mycenaean Greece (or the Mycenaean civilization) was the last phase of the 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 ...
, 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. Th ...
(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 with ...
, 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 Pha ...
, 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 Saronic ...
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 area' ...
, 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, stretchi ...
, 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 and Southern Europe and Anatolia, on the south by North Africa, and on the e ...
. 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 to ...
, Germany, forts were constructed with a limestone foundation supported by a
mudbrick A mudbrick or mud-brick is an air-dried brick, made of a mixture of loam, mud, sand and water mixed with a binding material such as rice husks or straw. Mudbricks are known from 9000 BCE, though since 4000 BCE, bricks have also bee ...
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 exist ...
(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 th ...
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 re ...
, during the reign of the Roman Emperors
Aurelian Aurelian ( la, Lucius Domitius Aurelianus; 9 September 214 October 275) was a Roman emperor, who reigned during the Crisis of the Third Century, from 270 to 275. As emperor, he won an unprecedented series of military victories which reunited t ...
and
Probus Probus may refer to: People * Marcus Valerius Probus (c. 20/30–105 AD), Roman grammarian * Marcus Pomponius Maecius Probus, consul in 228 * Probus (emperor), Roman Emperor (276–282) * Probus of Byzantium (–306), Bishop of Byzantium from 293 t ...
. 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 covers ...
and, on the right bank of the
Tiber The Tiber ( ; it, Tevere ; la, Tiberis) is the third-longest 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 it is joined by the Riv ...
, the
Trastevere Trastevere () is the 13th ''rione'' of Rome: it is identified by the initials R. XIII and it is located within Municipio I. Its name comes from Latin ''trans Tiberim'', literally 'beyond the Tiber'. Its coat of arms depicts a golden head of a lio ...
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 m ...
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 The Porta Nigra (Latin for ''black gate'') is a large Roman city gate in Trier, Germany. It is today the largest Roman city gate north of the Alps. It was designated as part of the Roman Monuments, Cathedral of St Peter and Church of Our Lady in ...
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. * Lincoln ...
.
Hadrian's Wall Hadrian's Wall ( la, Vallum Aelium), also known as the Roman Wall, Picts' Wall, or ''Vallum Hadriani'' in Latin, is a former defensive fortification of the Roman province of Britannia, begun in AD 122 in the reign of the Emperor Hadrian. R ...
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 Mediterr ...
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 Hadrian (; la, Caesar Trâiānus Hadriānus ; 24 January 76 – 10 July 138) was Roman emperor from 117 to 138. He was born in Italica (close to modern Santiponce in Spain), a Roman ''municipium'' founded by Italic settlers in Hispania B ...
(AD 76–138) in AD 122.


India

A number of forts dating from the
Later Stone Age The Later Stone Age (LSA) is a period in African prehistory that follows the Middle Stone Age. The Later Stone Age is associated with the advent of modern human behavior in Africa, although definitions of this concept and means of studying it ar ...
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 himsel ...
may be found in India. "Fort" is the word used in India for all old fortifications. Numerous
Indus Valley Civilization The Indus Valley Civilisation (IVC), also known as the Indus Civilisation was a Bronze Age civilisation in the northwestern regions of South Asia, lasting from 3300 BCE to 1300 BCE, and in its mature form 2600 BCE to 1900&n ...
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 f ...
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 identifi ...
exhibit
mudbrick A mudbrick or mud-brick is an air-dried brick, made of a mixture of loam, mud, sand and water mixed with a binding material such as rice husks or straw. Mudbricks are known from 9000 BCE, though since 4000 BCE, bricks have also bee ...
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, Ind