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Siege tower
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A siege tower (or in the Middle Ages a belfry) is a specialized siege engine, constructed to protect assailants and ladders while approaching the defensive walls of a fortification. The tower was often rectangular with four wheels and a height roughly equal to that of the wall or sometimes higher to allow archers to stand on top of the tower and fire into the fortification. Because the towers were wooden and thus flammable, they had to have some non-flammable covering of iron or fresh animal skins. The siege tower was mainly made from wood but sometimes they had metal parts.
Used since the 9th century BC in the ancient Near East, 305 BC in Europe and also in antiquity in the Far East, siege towers were of unwieldy dimensions and, like trebuchets, were therefore mostly constructed on site of the siege. Taking considerable time to construct, siege towers were mainly built if the defense of the opposing fortification could not be overcome by ladder assault, by mining or by breaking walls or gates.
The siege tower sometimes housed pikemen, swordsmen, or crossbowmen who shot quarrels at the defenders. Because of the size of the tower it would often be the first target of large stone catapults but it had its own projectiles with which to retaliate.
Siege towers were used to get troops over an enemy wall. When a siege tower was near a wall, it would drop a gangplank between it and the wall. Troops could then rush onto the walls and into the castle or city.
Medieval and later use With the collapse of the Roman Empire in the West into independent states, and the Eastern Roman Empire on the defensive, the use of siege towers reached its height during the medieval period. Siege towers were used when the Avars laid siege unsuccessfully to Constantinople in 626, as the Chronicon Paschale recounts:
At this siege the attackers also made use of "sows" - mobile armoured shelters which were used throughout the medieval period, and allowed workers to fill in moats with protection from the defenders (thus levelling the ground for the siege towers to be moved to the walls). However, the construction of a sloping talus at the base of a castle wall (as was common in Crusader fortification) could have reduced the effectiveness of this tactic to an extent.
Siege towers also became more elaborate during the medieval period; at the Siege of Kenilworth Castle in 1266, for example, 200 archers and 11 catapults operated from a single tower. Even then, the siege lasted almost a year, making it the longest siege in English history. They were not invulnerable either, as during the Fall of Constantinople in 1453, Ottoman siege towers were sprayed by the defenders with Greek fire.
Siege towers became vulnerable and obsolete with the development of large cannon. They had only ever existed to get assaulting troops over high walls and large cannon also made high walls obsolete as fortification took a new direction. However, later constructions known as battery-towers took on a similar role in the gunpowder age; like siege-towers, these were built out of wood on site for mounting siege artillery. One of these was built by the Russian military engineer Ivan Vyrodkov during the siege of Kazan in 1552 (as part of the Russo-Kazan Wars), and could hold ten large-calibre cannon and 50 lighter cannon.
Modern imageAlthough siege towers have long been obviated as a military unit, they have appeared in several films: they were notably featured in Peter Jackson's film (2003) during the siege of Minas Tirith, and also in the 2005 film Kingdom of Heaven. They are popular, though not necessarily common, in both historical and fantasy miniature wargaming, such as The Lord of the Rings Strategy Battle Game. The Real Time Strategy game Empire Earth also features siege towers as a unit.
The computer game Age of Mythology features Helepolis units for the Greek forces, firing ballistae from range and being able to garrison other units as well as Egyptian Siege Towers which ram buildings, fire arrows at units and can also garrison units. The older Age Of Empires I game also features Helepolis units, but instead as the upgraded version of the ballista. and offer a more realistic rendition of siege towers, used for attacking fortified walls.
Additionally, although the rook in Chess originally symbolized a chariot, European adaptations of the game may have been influenced at least in part by Siege towers.
Modern useAs an example of the extremely rare use of something resembling siege towers in present times, the machinery used by police forces to enter Ungdomshuset in Copenhagen, Denmark should be mentioned. On 1 March 2007, armored police officers were lifted to the upper levels of the building using small boom cranes. The officers were placed in containers which were lifted to the windows, thus enabling the police to gain access to the illegally held structure.
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