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A siege is a military blockade of a city, or
fortress 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'' ...
, 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 by one party holding a strong, static, defensive position. Consequently, an opportunity for negotiation between combatants is common, as proximity and fluctuating advantage can encourage diplomacy. The art of conducting and resisting sieges is called siege warfare, siegecraft, or poliorcetics. A siege occurs when an attacker encounters a city or fortress that cannot be easily taken by a quick assault, and which refuses to surrender. Sieges involve surrounding the target to block the provision of supplies and the reinforcement or escape of troops (a tactic known as " investment"). This is typically coupled with attempts to reduce the fortifications by means of
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 othe ...
s,
artillery Artillery is a class of heavy military ranged weapons that launch munitions far beyond the range and power of infantry firearms. Early artillery development focused on the ability to breach defensive walls and fortifications during sieges, ...
bombardment, mining (also known as sapping), or the use of deception or treachery to bypass defenses. Failing a military outcome, sieges can often be decided by starvation, thirst, or disease, which can afflict either the attacker or defender. This form of siege, though, can take many months or even years, depending upon the size of the stores of food the fortified position holds. The attacking force can circumvallate the besieged place, which is to build a line of earth-works, consisting of a rampart and trench, surrounding it. During the process of circumvallation, the attacking force can be set upon by another force, an ally of the besieged place, due to the lengthy amount of time required to force it to capitulate. A defensive ring of forts outside the ring of circumvallated forts, called contravallation, is also sometimes used to defend the attackers from outside. Ancient cities in the Middle East show
archaeological Archaeology or archeology is the scientific study of human activity through the recovery and analysis of material culture. The archaeological record consists of artifacts, architecture, biofacts or ecofacts, sites, and cultural landscap ...
evidence of fortified
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. During the Warring States era of
ancient China The earliest known written records of the history of China date from as early as 1250 BC, from the Shang dynasty (c. 1600–1046 BC), during the reign of king Wu Ding. Ancient historical texts such as the ''Book of Documents'' (early chapter ...
, there is both textual and archaeological evidence of prolonged sieges and siege machinery used against the defenders of city walls. Siege machinery was also a tradition of the ancient Greco-Roman world. During the Renaissance and the early modern period, siege warfare dominated the conduct of war in Europe. Leonardo da Vinci gained as much of his renown from the design of fortifications as from his artwork. Medieval campaigns were generally designed around a succession of sieges. In the Napoleonic era, increasing use of ever more powerful
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 during ...
s reduced the value of fortifications. In the 20th century, the significance of the classical siege declined. With the advent of mobile warfare, a single fortified stronghold is no longer as decisive as it once was. While traditional sieges do still occur, they are not as common as they once were due to changes in modes of battle, principally the ease by which huge volumes of destructive power can be directed onto a static target. Modern sieges are more commonly the result of smaller hostage, militant, or extreme resisting arrest situations.


Ancient period


The necessity of city walls

The
Assyria Assyria (Neo-Assyrian cuneiform: , romanized: ''māt Aššur''; syc, ܐܬܘܪ, ʾāthor) was a major ancient Mesopotamian civilization which existed as a city-state at times controlling regional territories in the indigenous lands of the ...
ns deployed large labour forces to build new palaces, temples, and defensive walls. 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& ...
were also fortified. By about 3500 BC, hundreds of small farming villages dotted the
Indus River 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 were clustered behind massive stone flood dikes and defensive walls, for neighbouring communities quarrelled constantly about the control of prime agricultural land. Mundigak (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. City walls and fortifications were essential for the defence of the first cities in the
ancient Near East The ancient Near East was the home of early civilizations within a region roughly corresponding to the modern Middle East: Mesopotamia (modern Iraq, southeast Turkey, southwest Iran and northeastern Syria), ancient Egypt, ancient Iran (Elam, ...
. The walls were built of mudbricks, stone, wood, or a combination of these materials, depending on local availability. They may also have served the dual purpose of showing potential enemies the might of the kingdom. The great walls surrounding the Sumerian city of
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 ...
gained a widespread reputation. The walls were in length, and up to in height. Later, the walls of Babylon, reinforced by towers, moats, and ditches, gained a similar reputation. In Anatolia, the Hittites built massive stone walls around their cities atop hillsides, taking advantage of the terrain. In Shang Dynasty China, at the site of Ao, large walls were erected in the 15th century BC that had dimensions of in width at the base and enclosed an area of some squared.Needham, Volume 4, Part 2, 43. The ancient Chinese capital for the State of Zhao, Handan, founded in 386 BC, also had walls that were wide at the base; they were tall, with two separate sides of its rectangular enclosure at a length of 1,530 yd (1,400 m). The cities of the Indus Valley Civilization showed less effort in constructing defences, as did the Minoan civilization on
Crete Crete ( el, Κρήτη, translit=, Modern: , Ancient: ) is the largest and most populous of the Greek islands, the 88th largest island in the world and the fifth largest island in the Mediterranean Sea, after Sicily, Sardinia, Cypru ...
. These civilizations probably relied more on the defence of their outer borders or sea shores. Unlike the ancient Minoan civilization, the
Mycenaean Greeks Mycenaean Greece (or the Mycenaean civilization) was the last phase of the Bronze Age in Ancient Greece, spanning the period from approximately 1750 to 1050 BC.. It represents the first advanced and distinctively Greek civilization in mainlan ...
emphasized the need for fortifications alongside natural defences of mountainous terrain, such as the massive
Cyclopean walls 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 ...
built at Mycenae and other adjacent Late Bronze Age (c. 1600–1100 BC) centers of central and southern Greece.


Archaeological evidence

Although there are depictions of sieges from the ancient Near East in historical sources and in art, there are very few examples of siege systems that have been found archaeologically. Of the few examples, several are noteworthy: * The late 9th-century BC siege system surrounding
Tell es-Safi Tell es-Safi ( ar, تل الصافي, Tall aṣ-Ṣāfī, "White hill"; he, תל צפית, ''Tel Tzafit'') was an Arab Palestinian village, located on the southern banks of Wadi 'Ajjur, northwest of Hebron which had its Arab population expelled ...
/ Gath, Israel, consists of a 2.5 km long siege trench, towers, and other elements, and is the earliest evidence of a
circumvallation Investment is the military process of surrounding an enemy fort (or town) with armed forces to prevent entry or escape. It serves both to cut communications with the outside world and to prevent supplies and reinforcements from being introduced. ...
system known in the world. It was apparently built by Hazael of
Aram Damascus The Kingdom of Aram-Damascus () was an Aramean polity that existed from the late-12th century BCE until 732 BCE, and was centred around the city of Damascus in the Southern Levant. Alongside various tribal lands, it was bounded in its later ye ...
, as part of his siege and conquest of Philistine Gath in the late 9th century BC (mentioned in II Kings 12:18). * The late 8th-century BC siege system surrounding the site of Lachish (Tell el-Duweir) in Israel, built by Sennacherib of
Assyria Assyria (Neo-Assyrian cuneiform: , romanized: ''māt Aššur''; syc, ܐܬܘܪ, ʾāthor) was a major ancient Mesopotamian civilization which existed as a city-state at times controlling regional territories in the indigenous lands of the ...
in 701 BC, is not only evident in the archaeological remains, but is described in Assyrian and
biblical The Bible (from Koine Greek , , 'the books') is a collection of religious texts or scriptures that are held to be sacred in Christianity, Judaism, Samaritanism, and many other religions. The Bible is an anthologya compilation of texts of a ...
sources and in the reliefs of Sennacherib's palace in Nineveh. * The siege of Alt-
Paphos Paphos ( el, Πάφος ; tr, Baf) is a coastal city in southwest Cyprus and the capital of Paphos District. In classical antiquity, two locations were called Paphos: Old Paphos, today known as Kouklia, and New Paphos. The current city of P ...
, Cyprus by the
Persian Persian may refer to: * People and things from Iran, historically called ''Persia'' in the English language ** Persians, the majority ethnic group in Iran, not to be conflated with the Iranic peoples ** Persian language, an Iranian language of the ...
army in the 4th century BC.


Depictions

The earliest representations of siege warfare have been dated to the
Protodynastic Period of Egypt Naqada III is the last phase of the Naqada culture of ancient Egyptian prehistory, dating from approximately 3200 to 3000 BC. It is the period during which the process of state formation, which began in Naqada II, became highly visible, ...
, c. 3000 BC. These show the symbolic destruction of city walls by divine animals using hoes. The first siege equipment is known from Egyptian tomb reliefs of the 24th century BC, showing Egyptian soldiers storming
Canaan Canaan (; Phoenician: 𐤊𐤍𐤏𐤍 – ; he, כְּנַעַן – , in pausa – ; grc-bib, Χανααν – ;The current scholarly edition of the Greek Old Testament spells the word without any accents, cf. Septuaginta : id est Vetus Te ...
ite town walls on wheeled siege ladders. Later Egyptian temple reliefs of the 13th century BC portray the violent
siege of Dapur The siege of Dapur occurred as part of Pharaoh Ramesses II's campaign to suppress Galilee and conquer Syria in 1269 BC. He described his campaign on the wall of his mortuary temple, the Ramesseum in Thebes, Egypt. The inscriptions say that Dapu ...
, a Syrian city, with soldiers climbing scale ladders supported by archers.
Assyria Assyria (Neo-Assyrian cuneiform: , romanized: ''māt Aššur''; syc, ܐܬܘܪ, ʾāthor) was a major ancient Mesopotamian civilization which existed as a city-state at times controlling regional territories in the indigenous lands of the ...
n palace reliefs of the 9th to 7th centuries BC display sieges of several Near Eastern cities. Though a simple battering ram had come into use in the previous millennium, the Assyrians improved siege warfare and used huge wooden tower-shaped battering rams with archers positioned on top. In ancient China, sieges of city walls (along with naval battles) were portrayed on
bronze Bronze is an alloy consisting primarily of copper, commonly with about 12–12.5% tin and often with the addition of other metals (including aluminium, manganese, nickel, or zinc) and sometimes non-metals, such as phosphorus, or metalloids such ...
'hu' vessels, like those found in
Chengdu Chengdu (, ; simplified Chinese: 成都; pinyin: ''Chéngdū''; Sichuanese pronunciation: , Standard Chinese pronunciation: ), alternatively romanized as Chengtu, is a sub-provincial city which serves as the capital of the Chinese provi ...
, Sichuan in 1965, which have been dated to the Warring States period (5th to 3rd centuries BC).Needham, Volume 5, Part 6, 446.


Tactics


Offensive

An attacker's first act in a siege might be a surprise attack, attempting to overwhelm the defenders before they were ready or were even aware there was a threat. This was how William de Forz captured Fotheringhay Castle in 1221. The most common practice of siege warfare was to lay siege and just wait for the surrender of the enemies inside or, quite commonly, to coerce someone inside to betray the fortification. During the medieval period, negotiations would frequently take place during the early part of the siege. An attacker – aware of a prolonged siege's great cost in time, money, and lives – might offer generous terms to a defender who surrendered quickly. The defending troops would be allowed to march away unharmed, often retaining their weapons. However, a garrison commander who was thought to have surrendered too quickly might face execution by his own side for treason. As a siege progressed, the surrounding army would build
earthworks Earthworks may refer to: Construction *Earthworks (archaeology), human-made constructions that modify the land contour *Earthworks (engineering), civil engineering works created by moving or processing quantities of soil *Earthworks (military), mi ...
(a line of
circumvallation Investment is the military process of surrounding an enemy fort (or town) with armed forces to prevent entry or escape. It serves both to cut communications with the outside world and to prevent supplies and reinforcements from being introduced. ...
) to completely encircle their target, preventing food, water, and other supplies from reaching the besieged city. If sufficiently desperate as the siege progressed, defenders and civilians might have been reduced to eating anything vaguely edible – horses, family pets, the leather from shoes, and even each other. The Hittite siege of a rebellious Anatolian vassal in the 14th century BC ended when the queen mother came out of the city and begged for mercy on behalf of her people. The Hittite campaign against the kingdom of Mitanni in the 14th century BC bypassed the fortified city of
Carchemish Carchemish ( Turkish: ''Karkamış''; or ), also spelled Karkemish ( hit, ; Hieroglyphic Luwian: , /; Akkadian: ; Egyptian: ; Hebrew: ) was an important ancient capital in the northern part of the region of Syria. At times during i ...
. If the main objective of a campaign was not the conquest of a particular city, it could simply be passed by. When the main objective of the campaign had been fulfilled, the Hittite army returned to Carchemish and the city fell after an eight-day siege. Disease was another effective siege weapon, although the attackers were often as vulnerable as the defenders. In some instances, catapults or similar weapons were used to fling diseased animals over city walls in an early example of
biological warfare Biological warfare, also known as germ warfare, is the use of biological toxins or infectious agents such as bacteria, viruses, insects, and fungi with the intent to kill, harm or incapacitate humans, animals or plants as an act of war. B ...
. If all else failed, a besieger could claim the booty of his conquest undamaged, and retain his men and equipment intact, for the price of a well-placed
bribe Bribery is the offering, giving, receiving, or soliciting of any item of value to influence the actions of an official, or other person, in charge of a public or legal duty. With regard to governmental operations, essentially, bribery is "Corru ...
to a disgruntled gatekeeper. The Assyrian siege of Jerusalem in the 8th century BC came to an end when the Israelites bought them off with gifts and tribute, according to the
Assyria Assyria (Neo-Assyrian cuneiform: , romanized: ''māt Aššur''; syc, ܐܬܘܪ, ʾāthor) was a major ancient Mesopotamian civilization which existed as a city-state at times controlling regional territories in the indigenous lands of the ...
n account, or when the Assyrian camp was struck by mass death, according to the
Biblical The Bible (from Koine Greek , , 'the books') is a collection of religious texts or scriptures that are held to be sacred in Christianity, Judaism, Samaritanism, and many other religions. The Bible is an anthologya compilation of texts of a ...
account. Due to logistics, long-lasting sieges involving a minor force could seldom be maintained. A besieging army, encamped in possibly squalid field conditions and dependent on the countryside and its own supply lines for food, could very well be threatened with the disease and starvation intended for the besieged. To end a siege more rapidly, various methods were developed in ancient and medieval times to counter fortifications, and a large variety of
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 othe ...
s was developed for use by besieging armies. Ladders could be used to
escalade {{Unreferenced, date=May 2007 Escalade is the act of scaling defensive walls or ramparts with the aid of ladders. Escalade was a prominent feature of sieges in ancient and medieval warfare, and though it is no longer common in modern warfa ...
over the defenses.
Battering ram A battering ram is a siege engine that originated in ancient times and was designed to break open the masonry walls of fortifications or splinter their wooden gates. In its simplest form, a battering ram is just a large, heavy log carried by ...
s and siege hooks could also be used to force through gates or walls, while
catapult A catapult is a ballistic device used to launch a projectile a great distance without the aid of gunpowder or other propellants – particularly various types of ancient and medieval siege engines. A catapult uses the sudden release of stored ...
s,
ballista The ballista (Latin, from Greek βαλλίστρα ''ballistra'' and that from βάλλω ''ballō'', "throw"), plural ballistae, sometimes called bolt thrower, was an ancient missile weapon that launched either bolts or stones at a distant ta ...
e, trebuchets,
mangonel The mangonel, also called the traction trebuchet, was a type of trebuchet used in Ancient China starting from the Warring States period, and later across Eurasia by the 6th century AD. Unlike the later counterweight trebuchet, the mangonel operat ...
s, and onagers could be used to launch projectiles to break down a city's fortifications and kill its defenders. A siege tower, a substantial structure built to equal or greater height than the fortification's walls, could allow the attackers to fire down upon the defenders and also advance troops to the wall with less danger than using ladders. In addition to launching projectiles at the fortifications or defenders, it was also quite common to attempt to undermine the fortifications, causing them to collapse. This could be accomplished by digging a tunnel beneath the
foundations Foundation may refer to: * Foundation (nonprofit), a type of charitable organization ** Foundation (United States law), a type of charitable organization in the U.S. ** Private foundation, a charitable organization that, while serving a good cause ...
of the walls, and then deliberately collapsing or exploding the tunnel. This process is known as mining. The defenders could dig counter-tunnels to cut into the attackers' works and collapse them prematurely. Fire was often used as a weapon when dealing with wooden fortifications. The
Byzantine Empire The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinopl ...
used
Greek fire Greek fire was an incendiary weapon used by the Eastern Roman Empire beginning . Used to set fire to enemy ships, it consisted of a combustible compound emitted by a flame-throwing weapon. Some historians believe it could be ignited on contact w ...
, which contained additives that made it hard to extinguish. Combined with a primitive
flamethrower A flamethrower is a ranged incendiary device designed to project a controllable jet of fire. First deployed by the Byzantine Empire in the 7th century AD, flamethrowers saw use in modern times during World War I, and more widely in Wor ...
, it proved an effective offensive and defensive weapon.


Defensive

The universal method for defending against siege is the use of fortifications, principally 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 ...
, to supplement natural features. A sufficient supply of food and water was also important to defeat the simplest method of siege warfare:
starvation Starvation is a severe deficiency in caloric energy intake, below the level needed to maintain an organism's life. It is the most extreme form of malnutrition. In humans, prolonged starvation can cause permanent organ damage and eventually, ...
. On occasion, the defenders would drive 'surplus' civilians out to reduce the demands on stored food and water. During the Warring States period in China (481–221 BC), warfare lost its honorable, gentlemen's duty that was found in the previous era of the Spring and Autumn period, and became more practical, competitive, cut-throat, and efficient for gaining victory. The Chinese invention of the hand-held, trigger-mechanism
crossbow A crossbow is a ranged weapon using an elastic launching device consisting of a bow-like assembly called a ''prod'', mounted horizontally on a main frame called a ''tiller'', which is hand-held in a similar fashion to the stock of a long fire ...
during this period revolutionized warfare, giving greater emphasis to infantry and cavalry and less to traditional
chariot A chariot is a type of cart driven by a charioteer, usually using horses to provide rapid motive power. The oldest known chariots have been found in burials of the Sintashta culture in modern-day Chelyabinsk Oblast, Russia, dated to c. 2000&nb ...
warfare. The philosophically pacifist
Mohist Mohism or Moism (, ) was an ancient Chinese philosophy of ethics and logic, rational thought, and science developed by the academic scholars who studied under the ancient Chinese philosopher Mozi (c. 470 BC – c. 391 BC), embodied in an eponym ...
s (followers of the philosopher
Mozi Mozi (; ; Latinized as Micius ; – ), original name Mo Di (), was a Chinese philosopher who founded the school of Mohism during the Hundred Schools of Thought period (the early portion of the Warring States period, –221 BCE). The a ...
) of the 5th century BC believed in aiding the defensive warfare of smaller Chinese states against the hostile offensive warfare of larger domineering states. The Mohists were renowned in the smaller states (and the enemies of the larger states) for the inventions of siege machinery to scale or destroy walls. These included traction trebuchet
catapult A catapult is a ballistic device used to launch a projectile a great distance without the aid of gunpowder or other propellants – particularly various types of ancient and medieval siege engines. A catapult uses the sudden release of stored ...
s, eight-foot-high
ballista The ballista (Latin, from Greek βαλλίστρα ''ballistra'' and that from βάλλω ''ballō'', "throw"), plural ballistae, sometimes called bolt thrower, was an ancient missile weapon that launched either bolts or stones at a distant ta ...
s, a wheeled siege ramp with
grappling hook A grappling hook or grapnel is a device that typically has multiple hooks (known as ''claws'' or ''flukes'') attached to a rope; it is thrown, dropped, sunk, projected, or fastened directly by hand to where at least one hook may catch and hol ...
s known as the Cloud Bridge (the protractible, folded ramp slinging forward by means of a counterweight with rope and pulley), and wheeled 'hook-carts' used to latch large iron hooks onto the tops of walls to pull them down. When enemies attempted to dig tunnels under walls for mining or entry into the city, the defenders used large
bellows A bellows or pair of bellows is a device constructed to furnish a strong blast of air. The simplest type consists of a flexible bag comprising a pair of rigid boards with handles joined by flexible leather sides enclosing an approximately airtigh ...
(the type the Chinese commonly used in heating up a
blast furnace A blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally pig iron, but also others such as lead or copper. ''Blast'' refers to the combustion air being "forced" or supplied above atmospheric ...
for smelting
cast iron Cast iron is a class of iron–carbon alloys with a carbon content more than 2%. Its usefulness derives from its relatively low melting temperature. The alloy constituents affect its color when fractured: white cast iron has carbide impuriti ...
) to pump smoke into the tunnels in order to suffocate the intruders. Advances in the prosecution of sieges in ancient and medieval times naturally encouraged the development of a variety of defensive countermeasures. In particular,
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 ...
s became progressively stronger—for example, the advent of the
concentric castle A concentric castle is a castle with two or more concentric curtain walls, such that the outer wall is lower than the inner and can be defended from it. The layout was square (at Belvoir and Beaumaris) where the terrain permitted, or an irreg ...
from the period of the Crusades—and more dangerous to attackers—witness the increasing use of
machicolation A machicolation (french: mâchicoulis) is a floor opening between the supporting corbels of a battlement, through which stones or other material, such as boiling water, hot sand, quicklime or boiling cooking oil, could be dropped on attackers at ...
s and murder-holes, as well the preparation of hot or incendiary substances.
Arrowslit An arrowslit (often also referred to as an arrow loop, loophole or loop hole, and sometimes a balistraria) is a narrow vertical aperture in a fortification through which an archer can launch arrows or a crossbowman can launch bolts. The interio ...
s (also called arrow loops or loopholes),
sally port A sally port is a secure, controlled entry way to an enclosure, e.g., a fortification or prison. The entrance is usually protected by some means, such as a fixed wall on the outside, parallel to the door, which must be circumvented to enter an ...
s (airlock-like doors) for sallies and deep water wells were also integral means of resisting siege at this time. Particular attention would be paid to defending entrances, with gates protected by
drawbridge A drawbridge or draw-bridge is a type of moveable bridge typically at the entrance to a castle or tower surrounded by a moat. In some forms of English, including American English, the word ''drawbridge'' commonly refers to all types of moveabl ...
s, portcullises, and
barbican A barbican (from fro, barbacane) is a fortified outpost or fortified gateway, such as at an outer defense perimeter of a city or castle, or any tower situated over a gate or bridge which was used for defensive purposes. Europe In the Middle A ...
s. Moats and other water defenses, whether natural or augmented, were also vital to defenders. In the European Middle Ages, virtually all large cities had city walls—
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in Dalmatia is a well-preserved example—and more important cities had
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. In ...
s,
fort 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'' ...
s, or
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. Great effort was expended to ensure a good water supply inside the city in case of siege. In some cases, long tunnels were constructed to carry water into the city. Complex systems of tunnels were used for storage and communications in medieval cities like
Tábor Tábor (; german: Tabor) is a town in the South Bohemian Region of the Czech Republic. It has about 33,000 inhabitants. The town centre is well preserved and is protected by law as an urban monument reservation. Administrative parts The follow ...
in
Bohemia Bohemia ( ; cs, Čechy ; ; hsb, Čěska; szl, Czechy) is the westernmost and largest historical region of the Czech Republic. Bohemia can also refer to a wider area consisting of the historical Lands of the Bohemian Crown ruled by the Bohe ...
, similar to those used much later in Vietnam during the Vietnam War. Until the invention of gunpowder-based weapons (and the resulting higher-velocity projectiles), the balance of power and logistics definitely favored the defender. With the invention of gunpowder, cannon and mortars and howitzers (in modern times), the traditional methods of defense became less effective against a determined siege.


Siege accounts

Although there are numerous ancient accounts of cities being sacked, few contain any clues to how this was achieved. Some popular tales existed on how the cunning heroes succeeded in their sieges. The best-known is the Trojan Horse of the Trojan War, and a similar story tells how the
Canaan Canaan (; Phoenician: 𐤊𐤍𐤏𐤍 – ; he, כְּנַעַן – , in pausa – ; grc-bib, Χανααν – ;The current scholarly edition of the Greek Old Testament spells the word without any accents, cf. Septuaginta : id est Vetus Te ...
ite city of Joppa was conquered by the Egyptians in the 15th century BC. The Biblical
Book of Joshua The Book of Joshua ( he, סֵפֶר יְהוֹשֻׁעַ‎ ', Tiberian: ''Sēp̄er Yŏhōšūaʿ'') is the sixth book in the Hebrew Bible and the Christian Old Testament, and is the first book of the Deuteronomistic history, the story of Israe ...
contains the story of the miraculous
Battle of Jericho The Battle of Jericho, as described in the Biblical Book of Joshua, was the first battle fought by the Israelites in the course of the conquest of Canaan. According to , the walls of Jericho fell after the Israelites marched around the city wall ...
. A more detailed historical account from the 8th century BC, called the Piankhi stela, records how the Nubians laid siege to and conquered several Egyptian cities by using battering rams, archers, and slingers and building causeways across moats.


Classical antiquity

During the Peloponnesian War, one hundred sieges were attempted and fifty-eight ended with the surrender of the besieged area.
Alexander the Great Alexander III of Macedon ( grc, Ἀλέξανδρος, Alexandros; 20/21 July 356 BC – 10/11 June 323 BC), commonly known as Alexander the Great, was a king of the ancient Greek kingdom of Macedon. He succeeded his father Philip II to ...
's army successfully besieged many powerful cities during his conquests. Two of his most impressive achievements in siegecraft took place in the siege of Tyre and the
siege of the Sogdian Rock The Sogdian Rock or Rock of Ariamazes, a fortress located north of Bactria in Sogdiana (near Samarkand), ruled by Arimazes, was captured by the forces of Alexander the Great in the early spring of 327 BC as part of his conquest of the Achaeme ...
. His
engineer Engineers, as practitioners of engineering, are professionals who invent, design, analyze, build and test machines, complex systems, structures, gadgets and materials to fulfill functional objectives and requirements while considering the lim ...
s built a
causeway A causeway is a track, road or railway on the upper point of an embankment across "a low, or wet place, or piece of water". It can be constructed of earth, masonry, wood, or concrete. One of the earliest known wooden causeways is the Sweet Tr ...
that was originally wide and reached the range of his torsion-powered artillery, while his soldiers pushed siege towers housing stone throwers and light catapults to bombard the city walls. Most conquerors before him had found Tyre, a Phoenician island-city about 1 km from the mainland, impregnable. The Macedonians built a
mole Mole (or Molé) may refer to: Animals * Mole (animal) or "true mole", mammals in the family Talpidae, found in Eurasia and North America * Golden moles, southern African mammals in the family Chrysochloridae, similar to but unrelated to Talpida ...
, a raised spit of earth across the water, by piling stones up on a natural
land bridge In biogeography, a land bridge is an isthmus or wider land connection between otherwise separate areas, over which animals and plants are able to cross and colonize new lands. A land bridge can be created by marine regression, in which sea lev ...
that extended underwater to the island, and although the Tyrians rallied by sending a fire ship to destroy the towers, and captured the mole in a swarming frenzy, the city eventually fell to the Macedonians after a seven-month siege. In complete contrast to Tyre, Sogdian Rock was captured by stealthy attack. Alexander used commando-like tactics to scale the cliffs and capture the high ground, and the demoralized defenders surrendered. The importance of siege warfare in the ancient period should not be underestimated. One of the contributing causes of Hannibal's inability to defeat Rome was his lack of
siege engines 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 other ...
, thus, while he was able to defeat Roman armies in the field, he was unable to capture Rome itself. The legionary armies of the Roman Republic and
Empire An empire is a "political unit" made up of several territories and peoples, "usually created by conquest, and divided between a dominant center and subordinate peripheries". The center of the empire (sometimes referred to as the metropole) ex ...
are noted as being particularly skilled and determined in siege warfare. An astonishing number and variety of sieges, for example, formed the core of Julius Caesar's mid-1st-century BC conquest of Gaul (modern France). In his ''
Commentarii de Bello Gallico ''Commentarii de Bello Gallico'' (; en, Commentaries on the Gallic War, italic=yes), also ''Bellum Gallicum'' ( en, Gallic War, italic=yes), is Julius Caesar's firsthand account of the Gallic Wars, written as a third-person narrative. In it C ...
'' (''Commentaries on the Gallic War''), Caesar describes how, at the Battle of Alesia, the Roman legions created two huge fortified walls around the city. The inner circumvallation, , held in Vercingetorix's forces, while the outer
contravallation Investment is the military process of surrounding an enemy fort (or town) with armed forces to prevent entry or escape. It serves both to cut communications with the outside world and to prevent supplies and reinforcements from being introduced. ...
kept relief from reaching them. The Romans held the ground in between the two walls. The besieged Gauls, facing starvation, eventually surrendered after their relief force met defeat against Caesar's auxiliary cavalry. The
Sicarii The Sicarii (Modern Hebrew: סיקריים ''siqariyim'') were a splinter group of the Jewish Zealots who, in the decades preceding Jerusalem's destruction in 70 CE, strongly opposed the Roman occupation of Judea and attempted to expel them and th ...
Zealots The Zealots were a political movement in 1st-century Second Temple Judaism which sought to incite the people of Judea Province to rebel against the Roman Empire and expel it from the Holy Land by force of arms, most notably during the First Jew ...
who defended
Masada Masada ( he, מְצָדָה ', "fortress") is an ancient fortification in the Southern District of Israel situated on top of an isolated rock plateau, akin to a mesa. It is located on the eastern edge of the Judaean Desert, overlooking the Dead ...
in AD 73 were defeated by the Roman legions, who built a ramp 100 m high up to the fortress's west wall. During the Roman-Persian Wars, siege warfare was extensively being used by both sides.


Medieval period


Arabia during Muhammad's era

The early Muslims, led by the Islamic prophet Muhammad, made extensive use of sieges during military campaigns. The first use was during the
Invasion of Banu Qaynuqa According to Islamic tradition, the invasion of Banu Qaynuqa, also known as the expedition against Banu Qaynuqa, occurred in AD 624. The Banu Qaynuqa were a Jewish tribe expelled by the Islamic prophet Muhammad for breaking the treaty known as t ...
. According to Islamic tradition, the invasion of Banu Qaynuqa occurred in 624 AD. The Banu Qaynuqa were a Jewish tribe expelled by Muhammad for allegedly breaking the treaty known as the
Constitution of Medina The Constitution of Medina (, ''Dustūr al-Madīna''), also known as the Charter of Medina ( ar, صحيفة المدينة, ''Ṣaḥīfat al-Madīnah''; or: , ''Mīthāq al-Madina'' "Covenant of Medina"), is the modern name given to a document be ...
. by pinning the clothes of a Muslim woman, which led to her being stripped naked. A Muslim killed a Jew in retaliation, and the Jews in turn killed the Muslim man. This escalated to a chain of revenge killings, and enmity grew between Muslims and the Banu Qaynuqa, leading to the siege of their fortress.. The tribe eventually surrendered to Muhammad, who initially wanted to kill the members of Banu Qaynuqa but ultimately yielded to
Abdullah ibn Ubayy ʿAbd Allāh ibn 'Ubayy ibn Salūl ( ar, عبد الله بن أبي بن سلول), died 631, was a chieftain of the Khazraj tribe of Medina. Upon the arrival of the Islamic prophet Muhammad, Ibn Ubayy seemingly became a Muslim, but Muslim tradi ...
's insistence and agreed to expel the Qaynuqa.. The second siege was during the
Invasion of Banu Nadir The invasion of Banu Nadir took place in May AD 625 ('' Rabi' al-awwal'', AH) 4. The account is related in Surah Al-Hashr (Chapter 59 - The Gathering) which describes the banishment of the Jewish tribe Banu Nadir who were expelled from Medina aft ...
. According to ''
The Sealed Nectar ''Ar-Raheeq Al-Makhtum'' ( ar, الرحيق المختوم; ), is a seerah book, or biography of the Prophet, which was written by Safiur Rahman Mubarakpuri. This book was awarded first prize by the Muslim World League in a worldwide competition ...
'', the siege did not last long; the Banu Nadir Jews willingly offered to comply with the Muhammad's order and leave Madinah. Their caravan counted 600 loaded camels, including their chiefs, Huyai bin Akhtab, and Salam bin Abi Al-Huqaiq, who left for Khaibar, whereas another party shifted to Syria. Two of them embraced Islam, Yameen bin ‘Amr and Abu Sa‘d bin Wahab, and so they retained their personal wealth. Muhammad seized their weapons, land, houses, and wealth. Amongst the other booty he managed to capture, there were 50 armours, 50 helmets, and 340 swords. This booty was exclusively Muhammad's because no fighting was involved in capturing it. He divided the booty at his own discretion among the early Emigrants and two poor Helpers, Abu Dujana and Suhail bin Haneef.
online
Other examples include the
Invasion of Banu Qurayza The Invasion of Banu Qurayza took place in Dhul Qa‘dah during January of CE 627 ( AH 5) and followed on from the Battle of the Trench (Muir, 1861). The Banu Qurayza initially told the Muslims that they were allied to them during the Battle ...
in February–March 627 and 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


Mongols and Chinese

In the Middle Ages, the Mongol Empire's campaign against China (then comprising the
Western Xia Dynasty The Western Xia or the Xi Xia (), officially the Great Xia (), also known as the Tangut Empire, and known as ''Mi-nyak''Stein (1972), pp. 70–71. to the Tanguts and Tibetans, was a Tangut-led Buddhist imperial dynasty of China tha ...
, Jin Dynasty, and Southern Song dynasty) by Genghis Khan until Kublai Khan, who eventually established the Yuan Dynasty in 1271, was very effective, allowing the Mongols to sweep through large areas. Even if they could not enter some of the more well-fortified cities, they used innovative battle tactics to grab hold of the land and the people: : By concentrating on the field armies, the strongholds had to wait. Of course, smaller fortresses, or ones easily surprised, were taken as they came along. This had two effects. First, it cut off the principal city from communicating with other cities where they might expect aid. Secondly, refugees from these smaller cities would flee to the last stronghold. The reports from these cities and the streaming hordes of refugees not only reduced the morale of the inhabitants and garrison of the principal city, it also strained their resources. Food and water reserves were taxed by the sudden influx of refugees. Soon, what was once a formidable undertaking became easy. The Mongols were then free to lay siege without interference of the field army, as it had been destroyed. At the siege of
Aleppo )), is an adjective which means "white-colored mixed with black". , motto = , image_map = , mapsize = , map_caption = , image_map1 = ...
,
Hulagu Hulagu Khan, also known as Hülegü or Hulegu ( mn, Хүлэгү/ , lit=Surplus, translit=Hu’legu’/Qülegü; chg, ; Arabic: fa, هولاکو خان, ''Holâku Khân;'' ; 8 February 1265), was a Mongol ruler who conquered much of West ...
used twenty catapults against the ''Bab al-Iraq'' ( Gate of Iraq) alone. In Jûzjânî, there are several episodes in which the Mongols constructed hundreds of siege machines in order to surpass the number which the defending city possessed. While Jûzjânî surely exaggerated, the improbably high numbers which he used for both the Mongols and the defenders do give one a sense of the large numbers of machines used at a single siege. Another Mongol tactic was to use catapults to launch corpses of plague victims into besieged cities. The disease-carrying fleas from the bodies would then infest the city, and the plague would spread, allowing the city to be easily captured, although this transmission mechanism was not known at the time. In 1346, the bodies of Mongol warriors of the Golden Horde who had died of plague were thrown over the walls of the besieged
Crimea Crimea, crh, Къырым, Qırım, grc, Κιμμερία / Ταυρική, translit=Kimmería / Taurikḗ ( ) is a peninsula in Ukraine, on the northern coast of the Black Sea, that has been occupied by Russia since 2014. It has a po ...
n city of Kaffa (now
Feodosiya uk, Феодосія, Теодосія crh, Kefe , official_name = () , settlement_type= , image_skyline = THEODOSIA 01.jpg , imagesize = 250px , image_caption = Genoese fortress of Caffa , image_shield = Fe ...
). It has been speculated that this operation may have been responsible for the advent of the
Black Death The Black Death (also known as the Pestilence, the Great Mortality or the Plague) was a bubonic plague pandemic occurring in Western Eurasia and North Africa from 1346 to 1353. It is the most fatal pandemic recorded in human history, causing ...
in Europe. The Black Death is estimated to have killed 30%–60% of Europe's population. On the first night while laying siege to a city, the leader of the Mongol forces would lead from a white tent: if the city surrendered, all would be spared. On the second day, he would use a red tent: if the city surrendered, the men would all be killed, but the rest would be spared. On the third day, he would use a black tent: no quarter would be given. However, the Chinese were not completely defenseless, and from AD 1234 until 1279, the Southern Song Chinese held out against the enormous barrage of Mongol attacks. Much of this success in defense lay in the world's first use of gunpowder (i.e. with early
flamethrower A flamethrower is a ranged incendiary device designed to project a controllable jet of fire. First deployed by the Byzantine Empire in the 7th century AD, flamethrowers saw use in modern times during World War I, and more widely in Wor ...
s, grenades, firearms, cannons, and
land mine A land mine is an explosive device concealed under or on the ground and designed to destroy or disable enemy targets, ranging from combatants to vehicles and tanks, as they pass over or near it. Such a device is typically detonated automatic ...
s) to fight back against the
Khitans The Khitan people (Khitan small script: ; ) were a historical nomadic people from Northeast Asia who, from the 4th century, inhabited an area corresponding to parts of modern Mongolia, Northeast China and the Russian Far East. As a people desce ...
, the
Tanguts The Tangut people ( Tangut: , ''mjɨ nja̱'' or , ''mji dzjwo''; ; ; mn, Тангуд) were a Tibeto-Burman tribal union that founded and inhabited the Western Xia dynasty. The group initially lived under Tuyuhun authority, but later submitted ...
, the Jurchens, and then the Mongols. The Chinese of the Song period also discovered the explosive potential of packing hollowed cannonball shells with gunpowder. Written later around 1350 in the ''
Huo Long Jing The ''Huolongjing'' (; Wade-Giles: ''Huo Lung Ching''; rendered in English as ''Fire Drake Manual'' or ''Fire Dragon Manual''), also known as ''Huoqitu'' (“Firearm Illustrations”), is a Chinese military treatise compiled and edited by Jiao ...
'', this manuscript of
Jiao Yu Jiao Yu () was a Chinese military general, philosopher, and writer of the Yuan dynasty and early Ming dynasty under Zhu Yuanzhang, who founded the dynasty and became known as the Hongwu Emperor. He was entrusted by Zhu as a leading artillery ...
recorded an earlier Song-era cast-iron cannon known as the 'flying-cloud thunderclap eruptor' (fei yun pi-li pao). The manuscript stated that ( Wade–Giles spelling):
The shells (''phao'') are made of cast iron, as large as a bowl and shaped like a ball. Inside they contain half a pound of 'magic' gunpowder (''shen huo''). They are sent flying towards the enemy camp from an eruptor (''mu phao''); and when they get there a sound like a thunder-clap is heard, and flashes of light appear. If ten of these shells are fired successfully into the enemy camp, the whole place will be set ablaze...Needham, Volume 5, Part 7, 264.
During the Ming Dynasty (AD 1368–1644), the Chinese were very concerned with city planning in regards to gunpowder warfare. The site for constructing the walls and the thickness of the walls in Beijing's Forbidden City were favoured by the Chinese Yongle Emperor (r. 1402–1424) because they were in pristine position to resist cannon volley and were built thick enough to withstand attacks from cannon fire. ''For more, see Technology of the Song dynasty.''


Age of gunpowder

The introduction of gunpowder and the use 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 during ...
s brought about a new age in siege warfare. Cannons were first used in Song dynasty China during the early 13th century, but did not become significant weapons for another 150 years or so. In early decades, cannons could do little against strong castles and fortresses, providing little more than smoke and fire. By the 16th century, however, they were an essential and regularized part of any campaigning army, or castle's defences. The greatest advantage of cannons over other siege weapons was the ability to fire a heavier projectile, farther, faster, and more often than previous weapons. They could also fire projectiles in a straight line, so that they could destroy the bases of high walls. Thus, 'old fashioned' walls – that is, high and, relatively, thin – were excellent targets, and, over time, easily demolished. In 1453, 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, the capital of the
Roman Empire The Roman Empire ( la, Imperium Romanum ; grc-gre, Βασιλεία τῶν Ῥωμαίων, Basileía tôn Rhōmaíōn) was the post-Roman Republic, Republican period of ancient Rome. As a polity, it included large territorial holdings aro ...
, were broken through in just six weeks by the 62 cannons of
Mehmed II Mehmed II ( ota, محمد ثانى, translit=Meḥmed-i s̱ānī; tr, II. Mehmed, ; 30 March 14323 May 1481), commonly known as Mehmed the Conqueror ( ota, ابو الفتح, Ebū'l-fetḥ, lit=the Father of Conquest, links=no; tr, Fâtih Su ...
's army, although in the end the conquest was a long and extremely difficult siege with heavy Ottoman casualties due to the repeated attempts at taking the city by assault. However, new fortifications, designed to withstand gunpowder weapons, were soon constructed throughout Europe. During the Renaissance and the early modern period, siege warfare continued to dominate the conduct of the European wars. Once siege guns were developed, the techniques for assaulting a town or fortress became well known and ritualized. The attacking army would surround a town. Then the town would be asked to surrender. If they did not comply, the besieging army would surround the town with temporary fortifications to stop sallies from the stronghold or relief getting in. The attackers would next build a length of trenches parallel to the defences (these are known as the "First parallel") and just out of range of the defending artillery. They would dig a trench (known as a Forward) towards the town in a
zigzag A zigzag is a pattern made up of small corners at variable angles, though constant within the zigzag, tracing a path between two parallel lines; it can be described as both jagged and fairly regular. In geometry, this pattern is described as a ...
pattern so that it could not be
enfilade Enfilade and defilade are concepts in military tactics used to describe a military formation's exposure to enemy fire. A formation or position is "in enfilade" if weapon fire can be directed along its longest axis. A unit or position is "in de ...
d by defending fire. Once they were within artillery range, they would dig another parallel (the Second Parallel) trench and fortify it with gun emplacements. This technique is commonly called entrenchment. If necessary, using the first artillery fire for cover, the forces conducting the siege would repeat the process until they placed their guns close enough to be laid (aimed) accurately to make a breach in the fortifications. In order to allow the forlorn hope and support troops to get close enough to exploit the breach, more zigzag trenches could be dug even closer to the walls, with more parallel trenches to protect and conceal the attacking troops. After each step in the process, the besiegers would ask the besieged to surrender. If the forlorn hope stormed the breach successfully, the defenders could expect no mercy.


Emerging theories

The castles that in earlier years had been formidable obstacles were easily breached by the new weapons. For example, in Spain, the newly equipped army of
Ferdinand and Isabella The Catholic Monarchs were Queen Isabella I of Castile and King Ferdinand II of Aragon, whose marriage and joint rule marked the ''de facto'' unification of Spain. They were both from the House of Trastámara and were second cousins, being bo ...
was able to conquer
Moorish The term Moor, derived from the ancient Mauri, is an exonym first used by Christian Europeans to designate the Muslim inhabitants of the Maghreb, the Iberian Peninsula, Sicily and Malta during the Middle Ages. Moors are not a distinct or se ...
strongholds in Granada in 1482–1492 that had held out for centuries before the invention of cannons. In the early 15th century, Italian architect Leon Battista Alberti wrote a treatise entitled ''De Re aedificatoria'', which theorized methods of building fortifications capable of withstanding the new guns. He proposed that walls be "built in uneven lines, like the teeth of a saw". He proposed star-shaped fortresses with low, thick walls. However, few rulers paid any attention to his theories. A few towns in Italy began building in the new style late in the 1480s, but it was only with the French invasion of the Italian peninsula in 1494–1495 that the new fortifications were built on a large scale. Charles VIII invaded Italy with an army of 18,000 men and a horse-drawn
siege-train 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 other ...
. As a result, he could defeat virtually any city or state, no matter how well defended. In a panic, military strategy was completely rethought throughout the Italian states of the time, with a strong emphasis on the new fortifications that could withstand a modern siege.


New fortresses

The most effective way to protect walls against cannonfire proved to be depth (increasing the width of the defences) and angles (ensuring that attackers could only fire on walls at an oblique angle, not square on). Initially, walls were lowered and backed, in front and behind, with earth. Towers were reformed into triangular bastions. This design matured into the ''
trace italienne 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 ...
''. Star-shaped fortresses surrounding towns and even cities with outlying defences proved very difficult to capture, even for a well-equipped army. Fortresses built in this style throughout the 16th century did not become fully obsolete until the 19th century, and were still in use throughout World War I (though modified for 20th-century warfare). During World War II, ''trace italienne'' fortresses could still present a formidable challenge, for example, in the last days of World War II, during the
Battle in Berlin The battle in Berlin was an end phase of the Battle of Berlin. While the Battle ''of'' Berlin encompassed the attack by three Soviet Army Groups to capture not only Berlin but the territory of Germany east of the River Elbe still under German c ...
, that saw some of the heaviest urban fighting of the war, the Soviets did not attempt to storm the Spandau Citadel (built between 1559 and 1594), but chose to
invest Investment is the dedication of money to purchase of an asset to attain an increase in value over a period of time. Investment requires a sacrifice of some present asset, such as time, money, or effort. In finance, the purpose of investing is ...
it and negotiate its surrender. However, the cost of building such vast modern fortifications was incredibly high, and was often too much for individual cities to undertake. Many were bankrupted in the process of building them; others, such as
Siena Siena ( , ; lat, Sena Iulia) is a city in Tuscany, Italy. It is the capital of the province of Siena. The city is historically linked to commercial and banking activities, having been a major banking center until the 13th and 14th centuri ...
, spent so much money on fortifications that they were unable to maintain their armies properly, and so lost their wars anyway. Nonetheless, innumerable large and impressive fortresses were built throughout northern Italy in the first decades of the 16th century to resist repeated French invasions that became known as the Italian Wars. Many stand to this day. In the 1530s and '40s, the new style of fortification began to spread out of Italy into the rest of Europe, particularly to France, the Netherlands, and Spain. Italian engineers were in enormous demand throughout Europe, especially in war-torn areas such as the Netherlands, which became dotted by towns encircled in modern fortifications. The densely populated areas of Northern Italy and the United Provinces (the Netherlands) were infamous for their high degree of fortification of cities. It made campaigns in these areas very hard to successfully conduct, considering even minor cities had to be captured by siege within the span of the campaigning season. In the Dutch case, the possibility of flooding large parts of the land provided an additional obstacle to besiegers, for example at the siege of Leiden. For many years, defensive and offensive tactics were well balanced, leading to protracted and costly wars such as Europe had never known, involving more and more planning and government involvement. The new fortresses ensured that war rarely extended beyond a series of sieges. Because the new fortresses could easily hold 10,000 men, an attacking army could not ignore a powerfully fortified position without serious risk of counterattack. As a result, virtually all towns had to be taken, and that was usually a long, drawn-out affair, potentially lasting from several months to years, while the members of the town were starved to death. Most battles in this period were between besieging armies and relief columns sent to rescue the besieged.


Marshal Vauban and Van Coehoorn

At the end of the 17th century, two influential military engineers, the French Marshal Vauban and the Dutch military engineer
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 ...
, developed modern fortification to its pinnacle, refining siege warfare without fundamentally altering it: ditches would be dug; walls would be protected by
glacis A glacis (; ) in military engineering is an artificial slope as part of a medieval castle or in early modern fortresses. They may be constructed of earth as a temporary structure or of stone in more permanent structure. More generally, a glaci ...
; and
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 would
enfilade Enfilade and defilade are concepts in military tactics used to describe a military formation's exposure to enemy fire. A formation or position is "in enfilade" if weapon fire can be directed along its longest axis. A unit or position is "in de ...
an attacker. Both engineers developed their ideas independently, but came to similar general rules regarding defensive construction and offensive action against fortifications. Both were skilled in conducting sieges and defences themselves. Before Vauban and Van Coehoorn, sieges had been somewhat slapdash operations. Vauban and Van Coehoorn refined besieging to a science with a methodical process that, if uninterrupted, would break even the strongest fortifications. Examples of their styles of fortifications are
Arras Arras ( , ; pcd, Aro; historical nl, Atrecht ) is the prefecture of the Pas-de-Calais Departments of France, department, which forms part of the regions of France, region of Hauts-de-France; before the regions of France#Reform and mergers of ...
(Vauban) and the no-longer-existent fortress of
Bergen op Zoom Bergen op Zoom (; called ''Berrege'' in the local dialect) is a municipality and a city located in the south of the Netherlands. Etymology The city was built on a place where two types of soil meet: sandy soil and marine clay. The sandy soil ...
(Van Coehoorn). The main differences between the two lay in the difference in terrain on which Vauban and Van Coehoorn constructed their defences: Vauban in the sometimes more hilly and mountainous terrain of France, Van Coehoorn in the flat and floodable lowlands of the Netherlands. Planning and maintaining a siege is just as difficult as fending one off. A besieging army must be prepared to repel both sorties from the besieged area and also any attack that may try to relieve the defenders. It was thus usual to construct lines of trenches and defenses facing in both directions. The outermost lines, known as the lines of
contravallation Investment is the military process of surrounding an enemy fort (or town) with armed forces to prevent entry or escape. It serves both to cut communications with the outside world and to prevent supplies and reinforcements from being introduced. ...
, would surround the entire besieging army and protect it from attackers. This would be the first construction effort of a besieging army, built soon after a fortress or city had been invested. A line of circumvallation would also be constructed, facing in towards the besieged area, to protect against sorties by the defenders and to prevent the besieged from escaping. The next line, which Vauban usually placed at about 600 meters from the target, would contain the main batteries of heavy cannons so that they could hit the target without being vulnerable themselves. Once this line was established, work crews would move forward, creating another line at 250 meters. This line contained smaller guns. The final line would be constructed only 30 to 60 meters from the fortress. This line would contain the
mortars Mortar may refer to: * Mortar (weapon), an indirect-fire infantry weapon * Mortar (masonry), a material used to fill the gaps between blocks and bind them together * Mortar and pestle, a tool pair used to crush or grind * Mortar, Bihar, a village ...
and would act as a
staging area A staging area (otherwise staging point, staging base, or staging post) is a location in which organisms, people, vehicles, equipment, or material are assembled before use. It may refer to: * In construction, a designated area in which vehicles, ...
for attack parties once the walls were breached. Van Coehoorn developed a small and easily movable mortar named the
coehorn A Coehorn (also spelled ''cohorn'') is a lightweight mortar originally designed by Dutch military engineer Menno van Coehoorn. Concept and design Van Coehoorn came to prominence during the 1688–97 Nine Years War, whose tactics have been sum ...
, variations of which were used in sieges until the 19th century. It would also be from this line that miners working to undermine the fortress would operate. The trenches connecting the various lines of the besiegers could not be built perpendicular to the walls of the fortress, as the defenders would have a clear line of fire along the whole trench. Thus, these lines (known as saps) needed to be sharply jagged. Another element of a fortress was the
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. In ...
. Usually, a citadel was a "mini fortress" within the larger fortress, sometimes designed as a
reduit A reduit is a fortified structure such as a citadel or a keep into which the defending troops can retreat when the outer defences are breached. The term is also used to describe an area of a country, which, through a ring of heavy fortifications o ...
, but more often as a means of protecting the garrison from potential revolt in the city. The citadel was used in wartime and peacetime to keep the residents of the city in line. As in ages past, most sieges were decided with very little fighting between the opposing armies. An attacker's army was poorly served, incurring the high casualties that a direct assault on a fortress would entail. Usually, they would wait until supplies inside the fortifications were exhausted or disease had weakened the defenders to the point that they were willing to surrender. At the same time, diseases, especially typhus, were a constant danger to the encamped armies outside the fortress, and often forced a premature retreat. Sieges were often won by the army that lasted the longest. An important element of
strategy Strategy (from Greek στρατηγία ''stratēgia'', "art of troop leader; office of general, command, generalship") is a general plan to achieve one or more long-term or overall goals under conditions of uncertainty. In the sense of the " ar ...
for the besieging army was whether or not to allow the encamped city to surrender. Usually, it was preferable to graciously allow a surrender, both to save on casualties, and to set an example for future defending cities. A city that was allowed to surrender with minimal loss of life was much better off than a city that held out for a long time and was brutally butchered at the end. Moreover, if an attacking army had a reputation of killing and pillaging regardless of a surrender, then other cities' defensive efforts would be redoubled. Usually, a city would surrender (with no honour lost) when its inner lines of defence were reached by the attacker. In case of refusal, however, the inner lines would have to be stormed by the attacker and the attacking troops would be seen to be justified in sacking the city.


Siege warfare

Siege warfare dominated in Western Europe for most of the 17th and 18th centuries. An entire campaign, or longer, could be used in a single siege (for example,
Ostend Ostend ( nl, Oostende, ; french: link=no, Ostende ; german: link=no, Ostende ; vls, Ostende) is a coastal city and municipality, located in the province of West Flanders in the Flemish Region of Belgium. It comprises the boroughs of Mariaker ...
in 1601–1604;
La Rochelle La Rochelle (, , ; Poitevin-Saintongeais: ''La Rochéle''; oc, La Rochèla ) is a city on the west coast of France and a seaport on the Bay of Biscay, a part of the Atlantic Ocean. It is the capital of the Charente-Maritime department. With ...
in 1627–1628). This resulted in extremely prolonged conflicts. The balance was that, while siege warfare was extremely expensive and very slow, it was very successful—or, at least, more so than encounters in the field. Battles arose through clashes between besiegers and relieving armies, but the principle was a slow, grinding victory by the greater economic power. The relatively rare attempts at forcing pitched battles ( Gustavus Adolphus in 1630; the French against the Dutch in 1672 or 1688) were almost always expensive failures. The exception to this rule were the English. During the English Civil War, anything which tended to prolong the struggle, or seemed like want of energy and avoidance of a decision, was bitterly resented by the men of both sides. In France and Germany, the prolongation of a war meant continued employment for the soldiers, but in England, both sides were looking to end the war quickly. Even when in the end the
New Model Army The New Model Army was a standing army formed in 1645 by the Parliamentarians during the First English Civil War, then disbanded after the Stuart Restoration in 1660. It differed from other armies employed in the 1639 to 1653 Wars of the Th ...
—a regular professional army—developed the original decision-compelling spirit permeated the whole organisation, as was seen when pitched against regular professional continental troops the Battle of the Dunes during the Interregnum. Experienced commanders on both sides in the English Civil War recommended the abandonment of garrisoned fortifications for two primary reasons. The first, as for example proposed by the Royalist Sir Richard Willis to King Charles, was that by abandoning the garrisoning of all but the most strategic locations in one's own territory, far more troops would be available for the field armies, and it was the field armies which would decide the conflict. The other argument was that by slighting potential strong points in one's own territory, an enemy expeditionary force, or local enemy rising, would find it more difficult to consolidate territorial gains against an inevitable counterattack. Sir
John Meldrum Sir John Meldrum ( – died 1645) was a soldier of Scottish origin who spent 36 years in the service of the Stuart kings of Scotland and England, James VI and I and Charles I. In 1636, Meldrum was granted by letters-patent from the king licen ...
put forward just such an argument to the Parliamentary
Committee of Both Kingdoms The Committee of Both Kingdoms, (known as the Derby House Committee from late 1647), was a committee set up during the Wars of the Three Kingdoms by the Parliamentarian faction in association with representatives from the Scottish Covenanters, aft ...
, to justify his slighting of
Gainsborough Gainsborough or Gainsboro may refer to: Places * Gainsborough, Ipswich, Suffolk, England ** Gainsborough Ward, Ipswich * Gainsborough, Lincolnshire, a town in England ** Gainsborough (UK Parliament constituency) * Gainsborough, New South Wales, ...
in Lincolnshire. Sixty years later, during the War of the Spanish Succession, the Duke of Marlborough preferred to engage the enemy in pitched battles, rather than engage in siege warfare, although he was very proficient in both types of warfare. On 15 April 1746, the day before the
Battle of Culloden The Battle of Culloden (; gd, Blàr Chùil Lodair) was the final confrontation of the Jacobite rising of 1745. On 16 April 1746, the Jacobite army of Charles Edward Stuart was decisively defeated by a British government force under Prince W ...
, at
Dunrobin Castle Dunrobin Castle (mostly 1835–1845 — present) is a stately home in Sutherland, in the Highland area of Scotland, as well as the family seat of the Earl of Sutherland and the Clan Sutherland. It is located north of Golspie and approximatel ...
, a party of William Sutherland's militia conducted the last siege fought on the mainland of Great Britain against Jacobite members of
Clan MacLeod Clan MacLeod (; gd, Clann Mac Leòid ) is a Highland Scottish clan associated with the Isle of Skye. There are two main branches of the clan: the MacLeods of Harris and Dunvegan, whose chief is MacLeod of MacLeod, are known in Gaelic as ' ("se ...
.


Strategic concepts

In the French Revolutionary and Napoleonic Wars, new techniques stressed the division of armies into all-arms corps that would march separately and only come together on the battlefield. The less-concentrated army could now live off the country and move more rapidly over a larger number of roads. Fortresses commanding lines of communication could be bypassed and would no longer stop an invasion. Since armies could not live off the land indefinitely, Napoleon Bonaparte always sought a quick end to any conflict by pitched battle. This military revolution was described and codified by
Clausewitz Carl Philipp Gottfried (or Gottlieb) von Clausewitz (; 1 June 1780 – 16 November 1831) was a Prussian general and military theorist who stressed the "moral", in modern terms meaning psychological, and political aspects of waging war. His most ...
.


Industrial advances

Advances in artillery made previously impregnable defences useless. For example, the walls of Vienna that had held off the Turks in the mid-17th century were no obstacle to Napoleon in the early 19th. Where sieges occurred (such as the
siege of Delhi The siege of Delhi was one of the decisive conflicts of the Indian Rebellion of 1857. The rebellion against the authority of the East India Company was widespread through much of Northern India, but essentially it was sparked by the mass ...
and the siege of Cawnpore during the Indian Rebellion of 1857), the attackers were usually able to defeat the defences within a matter of days or weeks, rather than weeks or months as previously. The great Swedish white-elephant fortress of
Karlsborg Karlsborg (, outdatedly ) is a locality and the seat of Karlsborg Municipality, Västra Götaland County, Sweden. It had 3,551 inhabitants in 2010. This garrison town lies at the shore of lake Vättern in Västergötland. History The town of Kar ...
was built in the tradition of Vauban and intended as a reserve capital for Sweden, but it was obsolete before it was completed in 1869. Railways, when they were introduced, made possible the movement and supply of larger armies than those that fought in the Napoleonic Wars. It also reintroduced siege warfare, as armies seeking to use railway lines in enemy territory were forced to capture fortresses which blocked these lines. During the Franco-Prussian War, the battlefield front-lines moved rapidly through France. However, the Prussian and other German armies were delayed for months at the siege of Metz and the siege of Paris, due to the greatly increased firepower of the defending infantry, and the principle of detached or semi-detached forts with heavy-caliber
artillery Artillery is a class of heavy military ranged weapons that launch munitions far beyond the range and power of infantry firearms. Early artillery development focused on the ability to breach defensive walls and fortifications during sieges, ...
. This resulted in the later construction of fortress works across Europe, such as the massive fortifications at Verdun. It also led to the introduction of tactics which sought to induce surrender by bombarding the civilian population within a fortress, rather than the defending works themselves. The siege of Sevastopol during the
Crimean War The Crimean War, , was fought from October 1853 to February 1856 between Russia and an ultimately victorious alliance of the Ottoman Empire, France, the United Kingdom and Piedmont-Sardinia. Geopolitical causes of the war included the ...
and the siege of Petersburg (1864–1865) during the American Civil War showed that modern citadels, when improved by improvised defences, could still resist an enemy for many months. The
Siege of Plevna The siege of Pleven, was a major battle of the Russo-Turkish War of 1877–1878, fought by the joint army of Russia and Romania against the Ottoman Empire. After the Russian army crossed the Danube at Svishtov, it began advancing towards ...
during the
Russo-Turkish War (1877–1878) The Russo-Turkish War of 1877–1878 ( tr, 93 Harbi, lit=War of ’93, named for the year 1293 in the Islamic calendar; russian: Русско-турецкая война, Russko-turetskaya voyna, "Russian–Turkish war") was a conflict between th ...
proved that hastily constructed field defences could resist attacks prepared without proper resources, and were a portent of the trench warfare of World War I. Advances in firearms technology without the necessary advances in battlefield communications gradually led to the defence again gaining the ascendancy. An example of siege during this time, prolonged during 337 days due to the isolation of the surrounded troops, was the
siege of Baler The siege of Baler ( fil, Pagkubkob sa Baler; es, Sitio de Baler) was a battle of the Philippine Revolution. Filipino revolutionaries laid siege to a fortified church defended by Spanish troops in the town of Baler, Aurora, for 337 days, from ...
, in which a reduced group of Spanish soldiers was besieged in a small church by the
Philippine The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...
rebels in the course of the Philippine Revolution and the Spanish–American War, until months after the Treaty of Paris, the end of the conflict. Furthermore, the development of steamships availed greater speed to
blockade runner A blockade runner is a merchant vessel used for evading a naval blockade of a port or strait. It is usually light and fast, using stealth and speed rather than confronting the blockaders in order to break the blockade. Blockade runners usual ...
s, ships with the purpose of bringing cargo, e.g. food, to cities under blockade, as with
Charleston, South Carolina Charleston is the largest city in the U.S. state of South Carolina, the county seat of Charleston County, and the principal city in the Charleston–North Charleston metropolitan area. The city lies just south of the geographical midpoint ...
during the American Civil War.


Modern warfare


First World War

Mainly as a result of the increasing firepower (such as machine guns) available to defensive forces, First World War trench warfare briefly revived a form of siege warfare. Although siege warfare had moved out from an urban setting because city walls had become ineffective against modern weapons, trench warfare was nonetheless able to use many of the techniques of siege warfare in its prosecution (sapping, mining, barrage and, of course, attrition), but on a much larger scale and on a greatly extended front. More traditional sieges of fortifications took place in addition to trench sieges. The
siege of Tsingtao The siege of Tsingtao (or Tsingtau) was the attack on the German port of Tsingtao (now Qingdao) in China during World War I by Japan and the United Kingdom. The siege was waged against Imperial Germany between 27 August and 7 November 1914. T ...
was one of the first major sieges of the war, but the inability for significant resupply of the German garrison made it a relatively one-sided battle. The Germans and the crew of an Austro-Hungarian protected cruiser put up a hopeless defence and, after holding out for more than a week, surrendered to the Japanese, forcing the German East Asia Squadron to steam towards South America for a new coal source. The other major siege outside Europe during the First World War was in Mesopotamia, at the
siege of Kut The siege of Kut Al Amara (7 December 1915 – 29 April 1916), also known as the first battle of Kut, was the besieging of an 8,000 strong British Army garrison in the town of Kut, south of Baghdad, by the Ottoman Army. In 1915, its population ...
. After a failed attempt to move on Baghdad, stopped by the Ottomans at the bloody Battle of Ctesiphon, the British and their large contingent of Indian sepoy soldiers were forced to retreat to Kut, where the Ottomans under German General Baron Colmar von der Goltz laid siege. The British attempts to resupply the force via the
Tigris The Tigris () is the easternmost of the two great rivers that define Mesopotamia, the other being the Euphrates. The river flows south from the mountains of the Armenian Highlands through the Syrian and Arabian Deserts, and empties into the P ...
river failed, and rationing was complicated by the refusal of many Indian troops to eat cattle products. By the time the garrison fell on 29 April 1916, starvation was rampant. Conditions did not improve greatly under Turkish imprisonment. Along with the battles of
Tanga Tanga may refer to: Places Burkina Faso * , a town in eastern Burkina Faso * Tanga, Sidéradougou, a village in western Burkina Faso * Tanga-Pela, a village in northern-central Burkina Faso Other places * Tanga, Tanzania, a city and port on th ...
, Sandfontein,
Gallipoli The Gallipoli peninsula (; tr, Gelibolu Yarımadası; grc, Χερσόνησος της Καλλίπολης, ) is located in the southern part of East Thrace, the European part of Turkey, with the Aegean Sea to the west and the Dardanelles s ...
, and Namakura, it would be one of Britain's numerous embarrassing colonial defeats of the war. The largest sieges of the war, however, took place in Europe. The initial German advance into Belgium produced four major sieges: the
Battle of Liège 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 ...
, the Battle of Namur, the
siege of Maubeuge The siege of Maubeuge took place from at the Entrenched Camp of Maubeuge () the start of the First World War on the Western Front. The railway from Thionville (Diedenhofen, 1871–1919) to Luxembourg City, Arlon and Namur into Belgium had been ...
, and the siege of Antwerp. All four would prove crushing German victories, at Liège and Namur against the Belgians, at Maubeuge against the French and at Antwerp against a combined Anglo-Belgian force. The weapon that made these victories possible were the German Big Berthas and the
Skoda 305 mm Model 1911 The Škoda 30.5 cm Mörser M.11 was a siege howitzer produced by Škoda Works and used by the Austro-Hungarian Army during World War I and by Nazi Germany in World War II. Development Development began in 1906, when a development contract ...
siege mortars, one of the best siege mortars of the war, on loan from Austria-Hungary. These huge guns were the decisive weapon of siege warfare in the 20th century, taking part at Przemyśl, the Belgian sieges, on the Italian Front and Serbian Front, and even being reused in World War II. At the second siege of Przemyśl, the
Austro-Hungarian Austria-Hungary, often referred to as the Austro-Hungarian Empire,, the Dual Monarchy, or Austria, was a constitutional monarchy and great power in Central Europe between 1867 and 1918. It was formed with the Austro-Hungarian Compromise of ...
garrison showed an excellent knowledge of siege warfare, not only waiting for relief, but sending sorties into Russian lines and employing an active defence that resulted in the capture of the Russian General
Lavr Kornilov Lavr Georgiyevich Kornilov (russian: Лавр Гео́ргиевич Корни́лов, ; – 13 April 1918) was a Russian military intelligence officer, explorer, and general in the Imperial Russian Army during World War I and the ensuing Rus ...
. Despite its excellent performance, the garrison's food supply had been requisitioned for earlier offensives, a relief expedition was stalled by the weather, ethnic rivalries flared up between the defending soldiers, and a breakout attempt failed. When the commander of the garrison
Hermann Kusmanek Hermann or Herrmann may refer to: * Hermann (name), list of people with this name * Arminius, chieftain of the Germanic Cherusci tribe in the 1st century, known as Hermann in the German language * Éditions Hermann, French publisher * Hermann, Miss ...
finally surrendered, his troops were eating their horses and the first attempt of large-scale air supply had failed. It was one of the few great victories obtained by either side during the war; 110,000 Austro-Hungarian prisoners were marched back to Russia. Use of aircraft for siege running, bringing supplies to areas under siege, would nevertheless prove useful in many sieges to come. The largest siege of the war, and arguably the roughest, most gruesome battle in history, was the
Battle of Verdun The Battle of Verdun (french: Bataille de Verdun ; german: Schlacht um Verdun ) was fought from 21 February to 18 December 1916 on the Western Front (World War I), Western Front in France. The battle was the longest of the First World War and ...
. Whether the battle can be considered true siege warfare is debatable. Under the theories of
Erich von Falkenhayn General Erich Georg Sebastian Anton von Falkenhayn (11 September 1861 – 8 April 1922) was the second Chief of the German General Staff of the First World War from September 1914 until 29 August 1916. He was removed on 29 August 1916 after ...
, it is more distinguishable as purely attrition with a coincidental presence of fortifications on the battlefield. When considering the plans of
Crown Prince Wilhelm Wilhelm, German Crown Prince, Crown Prince of Prussia (Friedrich Wilhelm Victor August Ernst; 6 May 1882 – 20 July 1951) was the eldest child of the last ''Kaiser'', the German Emperor, Wilhelm II, and his consort Augusta Victoria of Schles ...
, purely concerned with taking the citadel and not with French casualty figures, it can be considered a true siege. The main fortifications were
Fort Douaumont Fort Douaumont (french: Fort de Douaumont) was the largest and highest fort on the ring of 19 large defensive works which had protected the city of Verdun, France, since the 1890s. By 1915, the French General Staff had concluded that even the be ...
,
Fort Vaux Fort Vaux (french: Fort de Vaux), in Vaux-Devant-Damloup, Meuse, France, was a polygonal fort forming part of the ring of 19 large defensive works intended to protect the city of Verdun. Built from 1881 to 1884 for 1,500,000 francs, it house ...
, and the fortified city of Verdun itself. The Germans, through the use of huge artillery bombardments, flamethrowers, and infiltration tactics, were able to capture both Vaux and Douaumont, but were never able to take the city, and eventually lost most of their gains. It was a battle that, despite the French ability to fend off the Germans, neither side won. The German losses were not worth the potential capture of the city, and the French casualties were not worth holding the symbol of her defence. The development of the armoured tank and improved infantry tactics at the end of World War I swung the pendulum back in favour of manoeuvre, and with the advent of Blitzkrieg in 1939, the end of traditional siege warfare was at hand. The Maginot Line would be the prime example of the failure of immobile, post–World War I fortifications. Although sieges would continue, it would be in a totally different style and on a reduced scale.


Second World War

The
Blitzkrieg Blitzkrieg ( , ; from 'lightning' + 'war') is a word used to describe a surprise attack using a rapid, overwhelming force concentration that may consist of armored and motorized or mechanized infantry formations, together with close air su ...
of the Second World War truly showed that fixed fortifications are easily defeated by manoeuvre instead of frontal assault or long sieges. The great Maginot Line was bypassed, and battles that would have taken weeks of siege could now be avoided with the careful application of air power (such as the German
paratrooper A paratrooper is a military parachutist—someone trained to parachute into a military operation, and usually functioning as part of an airborne force. Military parachutists (troops) and parachutes were first used on a large scale during Worl ...
capture of
Fort Eben-Emael Fort Eben-Emael (french: Fort d'Ében-Émael, ) is an inactive Belgian fortress located between Liège and Maastricht, on the Belgian-Dutch border, near the Albert Canal, outside the village of Ében-Émael. It was designed to defend Belgi ...
, Belgium, early in World War II). The most important siege was the
siege of Leningrad The siege of Leningrad (russian: links=no, translit=Blokada Leningrada, Блокада Ленинграда; german: links=no, Leningrader Blockade; ) was a prolonged military blockade undertaken by the Axis powers against the Soviet Union, So ...
, that lasted over 29 months, about half of the duration of the entire Second World War. The siege of Leningrad resulted in the deaths of some one million of the city's inhabitants. Along with the
Battle of Stalingrad The Battle of Stalingrad (23 August 19422 February 1943) was a major battle on the Eastern Front of World War II where Nazi Germany and its allies unsuccessfully fought the Soviet Union for control of the city of Stalingrad (later r ...
, the siege of Leningrad on the Eastern Front was the deadliest siege of a city in history. In the west, apart from the
Battle of the Atlantic The Battle of the Atlantic, the longest continuous military campaign in World War II, ran from 1939 to the defeat of Nazi Germany in 1945, covering a major part of the naval history of World War II. At its core was the Allied naval blockad ...
, the sieges were not on the same scale as those on the European Eastern front; however, there were several notable or critical sieges: the island of
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 ...
, for which the population won the George Cross and
Tobruk Tobruk or Tobruck (; grc, Ἀντίπυργος, ''Antipyrgos''; la, Antipyrgus; it, Tobruch; ar, طبرق, Tubruq ''Ṭubruq''; also transliterated as ''Tobruch'' and ''Tubruk'') is a port city on Libya's eastern Mediterranean coast, near t ...
. In the South-East Asian Theatre, there was the siege of Singapore, and in the Burma Campaign, sieges of
Myitkyina Myitkyina (, ; (Eng; ''mitchinar'') Jinghpaw: ''Myitkyina'', ) is the capital city of Kachin State in Myanmar (Burma), located from Yangon, and from Mandalay. In Burmese it means "near the big river", and Myitkyina is on the west bank of the ...
, the Admin Box, Imphal, and Kohima, which was the high-water mark for the Japanese advance into India. The siege of Sevastopol saw the use of the heaviest and most powerful individual siege engines ever to be used: the German 800mm railway gun and the 600mm siege mortar. Though a single shell could have disastrous local effect, the guns were susceptible to air attack in addition to being slow to move.


Airbridge

Throughout the war both the Western Allies and the Germans tried to supply forces besieged behind enemy lines with ad-hoc airbridges. Sometimes these attempts failed, as happened to the besieged German Sixth Army the
siege of Stalingrad The Battle of Stalingrad (23 August 19422 February 1943) was a major battle on the Eastern Front of World War II where Nazi Germany and its allies unsuccessfully fought the Soviet Union for control of the city of Stalingrad (later re ...
, and sometimes they succeeded as happened during the
Battle of the Admin Box The Battle of the Admin Box (sometimes referred to as the Battle of Ngakyedauk or the Battle of Sinzweya) took place on the southern front of the Burma campaign from 5 to 23 February 1944, in the South-East Asian Theatre of World War II. Japan ...
(5 – 23 February 1944) and, during the short
Siege of Bastogne The siege of Bastogne () was an engagement in December 1944 between American and German forces at the Belgian town of Bastogne, as part of the larger Battle of the Bulge. The goal of the German offensive was the harbor at Antwerp. In order to re ...
(December 1944). The logistics of strategic airbridge operations were developed by the Americans flying
military transport aircraft A military transport aircraft, military cargo aircraft or airlifter is a military-owned transport aircraft used to support military operations by airlifting troops and military equipment. Transport aircraft are crucial to maintaining supply l ...
from India to China over
the Hump The Hump was the name given by Allied pilots in the Second World War to the eastern end of the Himalayan Mountains over which they flew military transport aircraft from India to China to resupply the Chinese war effort of Chiang Kai-shek ...
(1942–1945), to resupply the Chinese war effort of
Chiang Kai-shek Chiang Kai-shek (31 October 1887 – 5 April 1975), also known as Chiang Chung-cheng and Jiang Jieshi, was a Chinese Nationalist politician, revolutionary, and military leader who served as the leader of the Republic of China (ROC) from 1928 ...
, and to the USAAF XX Bomber Command (during
Operation Matterhorn Operation Matterhorn was a military operation of the United States Army Air Forces in World War II for the strategic bombing of Japanese forces by B-29 Superfortresses based in India and China. Targets included Japan itself, and Japanese bases ...
). Tactical airbridge methods were developed and, as planned, used extensively for supplying the
Chindits The Chindits, officially as Long Range Penetration Groups, were special operations units of the British and Indian armies which saw action in 1943–1944 during the Burma Campaign of World War II. The British Army Brigadier Orde Wingate for ...
during Operation Thursday (February – May 1944). The Chindits a specially trained division of 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, ...
and
Indian Indian or Indians may refer to: Peoples South Asia * Indian people, people of Indian nationality, or people who have an Indian ancestor ** Non-resident Indian, a citizen of India who has temporarily emigrated to another country * South Asia ...
armies were flown deep behind Japanese front lines in the South-East Asian theatre to jungle clearings in
Burma Myanmar, ; UK pronunciations: US pronunciations incl. . Note: Wikipedia's IPA conventions require indicating /r/ even in British English although only some British English speakers pronounce r at the end of syllables. As John Wells explai ...
where they set up fortified airheads from which they sailed out to attack Japanese lines of communications, while defending the bases from Japanese counterattacks. The bases were re-supplied by air with casualties flown out by returning aircraft. When the Japanese attacked in strength the Chindits abandoned the bases and either moved to new bases, or back to Allied lines.


Post-Second World War

Several times during the Cold War the western powers had to use their airbridge expertise. * The
Berlin Blockade The Berlin Blockade (24 June 1948 – 12 May 1949) was one of the first major international crises of the Cold War. During the multinational occupation of post–World War II Germany, the Soviet Union blocked the Western Allies' railway, roa ...
from June 1948 to September 1949, the Western Powers flew over 200,000 flights, providing to West Berlin up to 8,893 tons of necessities each day. * Airbridge was used extensively during the
siege of Dien Bien Phu The Battle of Dien Bien Phu (french: Bataille de Diên Biên Phu ; vi, Chiến dịch Điện Biên Phủ, ) was a climactic confrontation of the First Indochina War that took place between 13 March and 7 May 1954. It was fought between the Fr ...
during the
First Indochina War The First Indochina War (generally known as the Indochina War in France, and as the Anti-French Resistance War in Vietnam) began in French Indochina from 19 December 1946 to 20 July 1954 between France and Việt Minh ( Democratic Republic of ...
, but failed to prevent its fall to the Việt Minh in 1954. * In the next Vietnam War, airbridge proved crucial during the siege of the American base at
Khe Sanh Khe Sanh is the district capital of Hướng Hoá District, Quảng Trị Province, Vietnam, located 63 km west of Đông Hà. During the Vietnam War, the Khe Sanh Combat Base was located to the north of the city. The Battle of Khe San ...
in 1968. The resupply it provided kept the
North Vietnamese Army The People's Army of Vietnam (PAVN; vi, Quân đội nhân dân Việt Nam, QĐNDVN), also recognized as the Vietnam People's Army (VPA) or the Vietnamese Army (), is the military force of the Socialist Republic of Vietnam and the armed wi ...
from capturing the base. In both Vietnamese cases, the Viet Minh and NLF were able to cut off the opposing army by capturing the surrounding rugged terrain. At Dien Bien Phu, the French were unable to use air power to overcome the siege and were defeated. However, at Khe Sanh, a mere 14 years later, advances in air power—and a reduction in Vietnamese anti-aircraft capability—allowed the United States to withstand the siege. The resistance of US forces was assisted by the PAVN and PLAF forces' decision to use the Khe Sanh siege as a strategic distraction to allow their mobile warfare offensive, the first
Tet Offensive The Tet Offensive was a major escalation and one of the largest military campaigns of the Vietnam War. It was launched on January 30, 1968 by forces of the Viet Cong (VC) and North Vietnamese People's Army of Vietnam (PAVN) against the forces o ...
, to unfold securely. The siege of Khe Sanh displays typical features of modern sieges, as the defender has greater capacity to withstand the siege, the attacker's main aim is to bottle operational forces or create a strategic distraction, rather than take the siege to a conclusion. In neighbouring Cambodia, at that time known as the Khmer Republic, the
Khmer Rouge The Khmer Rouge (; ; km, ខ្មែរក្រហម, ; ) is the name that was popularly given to members of the Communist Party of Kampuchea (CPK) and by extension to the regime through which the CPK ruled Cambodia between 1975 and 1979. ...
used siege tactics to cut off supplies from
Phnom Penh Phnom Penh (; km, ភ្នំពេញ, ) is the Capital city, capital and List of cities and towns in Cambodia, most populous city of Cambodia. It has been the national capital since the French protectorate of Cambodia and has grown to become ...
to other government-held enclaves in an attempt to break the will of the government to continue fighting. In 1972, during the Easter offensive, the siege of An Lộc Vietnam occurred. ARVN troops and U.S. advisers and air power successfully defeated communist forces. The Battle of An Lộc pitted some 6,350 ARVN men against a force three times that size. During the peak of the battle, ARVN had access to only one 105 mm howitzer to provide close support, while the enemy attack was backed by an entire artillery division. ARVN had no tanks, the NVA communist forces had two armoured regiments. ARVN prevailed after over two months of continuous fighting. As General Paul Vanuxem, a French veteran of the Indochina War, wrote in 1972 after visiting the liberated city of An Lộc: "An Lộc was the Verdun of Vietnam, where Vietnam received as in baptism the supreme consecration of her will." During the
1982 Lebanon War The 1982 Lebanon War, dubbed Operation Peace for Galilee ( he, מבצע שלום הגליל, or מבצע של"ג ''Mivtsa Shlom HaGalil'' or ''Mivtsa Sheleg'') by the Israeli government, later known in Israel as the Lebanon War or the First L ...
, the
Israel Defence Forces The Israel Defense Forces (IDF; he, צְבָא הַהֲגָנָה לְיִשְׂרָאֵל , ), alternatively referred to by the Hebrew-language acronym (), is the national military of the State of Israel. It consists of three service branch ...
besieged
Beirut Beirut, french: Beyrouth is the capital and largest city of Lebanon. , Greater Beirut has a population of 2.5 million, which makes it the third-largest city in the Levant region. The city is situated on a peninsula at the midpoint of ...
, the capital of Lebanon, to quickly realize their goals including the eviction of the
Palestine Liberation Organization The Palestine Liberation Organization (PLO; ar, منظمة التحرير الفلسطينية, ') is a Palestinian nationalist political and militant organization founded in 1964 with the initial purpose of establishing Arab unity and st ...
from the country. During the Yugoslav Wars in the 1990s,
Republika Srpska Republika Srpska ( sr-Cyrl, Република Српска, lit=Serb Republic, also known as Republic of Srpska, ) is one of the two entities of Bosnia and Herzegovina, the other being the Federation of Bosnia and Herzegovina. It is located ...
forces besieged Sarajevo, the capital of
Bosnia-Herzegovina Bosnia and Herzegovina ( sh, / , ), abbreviated BiH () or B&H, sometimes called Bosnia–Herzegovina and often known informally as Bosnia, is a country at the crossroads of south and southeast Europe, located in the Balkans. Bosnia and H ...
. The siege lasted from 1992 until 1996. Numerous sieges haven taken place during the Syrian Civil War, such as the
Siege of Homs The siege of Homs was a military confrontation between the Syrian military and the Syrian opposition in the city of Homs, a major rebel stronghold during the Syrian Civil War. The siege lasted three years from May 2011 to May 2014, and result ...
,
Siege of Kobanî The siege of Kobanî was launched by the Islamic State of Iraq and the Levant on 13 September 2014, in order to capture the Kobanî Canton and its main city of Kobanî (also known as Kobanê or Ayn al-Arab) in northern Syria, in the ''de facto' ...
,
Siege of Deir ez-Zor (2014–2017) The siege of Deir ez-Zor was a large-scale siege imposed by the Islamic State of Iraq and the Levant (ISIL) against several districts in the city of Deir ez-Zor held by the Syrian Army, in an attempt to capture the city and secure full control o ...
and
Siege of al-Fu'ah and Kafriya The siege of al-Fu'ah and Kefriya was a siege of the towns of al-Fu'ah and Kafriya, towns with majority Shia populations and controlled by Syrian government forces in the Idlib Governorate, during the Syrian Civil War. The siege was initiat ...
. Multiple sieges took place in the
2022 Russian invasion of Ukraine On 24 February 2022, in a major escalation of the Russo-Ukrainian War, which began in 2014. The invasion has resulted in tens of thousands of deaths on both sides. It has caused Europe's largest refugee crisis since World War II. An ...
, most notably the Siege of Mariupol.


Police activity

Siege tactics continue to be employed in police conflicts. This has been due to a number of factors, primarily risk to life, whether that of the police, the besieged, bystanders, or
hostage A hostage is a person seized by an abductor in order to compel another party, one which places a high value on the liberty, well-being and safety of the person seized, such as a relative, employer, law enforcement or government to act, or refr ...
s. Police make use of trained
negotiators Negotiation is a dialogue between two or more people or parties to reach the desired outcome regarding one or more issues of conflict. It is an interaction between entities who aspire to agree on matters of mutual interest. The agreement c ...
, psychologists, and, if necessary, force, generally being able to rely on the support of their nation's
armed forces 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 ...
if required. One of the complications facing police in a siege involving hostages is Stockholm syndrome, where sometimes hostages can develop a sympathetic rapport with their captors. This is considered positively if it keeps the hostage from being harmed, but there have been cases where hostages have tried to shield the captors during an assault or refused to cooperate with the authorities in bringing prosecutions. The 1993 police siege on the
Branch Davidian The Branch Davidians (or the General Association of Branch Davidian Seventh-day Adventists) were an apocalyptic new religious movement founded in 1955 by Benjamin Roden. They regard themselves as a continuation of the General Association of ...
church in
Waco, Texas Waco ( ) is the county seat of McLennan County, Texas, United States. It is situated along the Brazos River and I-35, halfway between Dallas and Austin. The city had a 2020 population of 138,486, making it the 22nd-most populous city in the st ...
, lasted 51 days, an atypically long police siege. Unlike traditional military sieges, police sieges are much shorter in general. They usually last for hours or days, rather than weeks, months, or years. In Britain, if the siege involves perpetrators who are considered by the British Government to be terrorists, and if an assault is to take place, the civilian authorities hand command and control over to the military. The threat of such an action ended the
Balcombe Street siege The Balcombe Street siege was an incident involving members of the Provisional Irish Republican Army (IRA) and London's Metropolitan Police lasting from 6 to 12 December 1975. The siege ended with the surrender of the four IRA members and the r ...
in 1975, but the Iranian Embassy siege in 1980 ended in a military assault and the deaths of all but one of the hostage-takers.


See also

* ''
Battleplan {{italic title ''Battleplan'' is a 2006 military television documentary series examining various military strategies used in modern warfare since World War I. It is shown on the Military Channel in the U.S. and Yesterday. Each episode looks at ...
'' (documentary TV series) *
Blitzkrieg Blitzkrieg ( , ; from 'lightning' + 'war') is a word used to describe a surprise attack using a rapid, overwhelming force concentration that may consist of armored and motorized or mechanized infantry formations, together with close air su ...
*
Breastwork (fortification) 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 ...
*
Infiltration Infiltration may refer to: Science, medicine, and engineering *Infiltration (hydrology), downward movement of water into soil *Infiltration (HVAC), a heating, ventilation, and air conditioning term for air leakage into buildings *Infiltration (me ...
* Last stand * Maneuver warfare * Medieval warfare *
Sangar (fortification) A sangar (or sanger) ( fa, سنگر) is a temporary fortified position with a breastwork originally constructed of stones, and now built of sandbags, gabions or similar materials. Sangars are normally constructed in terrain where the digging of ...
*
Siege engines 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 other ...
*
Siege equipment 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 othe ...
*
Tunnel warfare Tunnel warfare involves war being conducted in tunnel and other underground cavities. It often includes the construction of underground facilities (mining or undermining) in order to attack or defend, and the use of existing natural caves and ...
; Lists: *
List of established military terms This is a list of established military terms which have been in use for at least 50 years. Since technology and doctrine have changed over time, not all of them are in current use, or they may have been superseded by more modern terms. However, the ...
* List of sieges


Notes


References

* * * * * * * * * * * * * * * * * * * * * * *


Further reading

* * * * * * * Historiography *


External links


Native American Siege Warfare.








Biblical perspectives.
Secrets of Lost Empires: Medieval Siege
(PBS) Informative and interactive webpages about medieval siege tactics. {{Authority control Military strategy * Warfare of the Middle Ages