Siege tower

In the First Intermediate Period tomb of General Intef at Thebes (modern Luxor, Egypt), a mobile siege tower is shown in the battle scenes.[2] In modern Harpoot, Turkey, an artistically Akkadian style stone carved relief dated circa 2000 BC was found depicting a siege tower, the earliest known visual depiction from Anatolia (although siege towers were later described in Hittite cuneiform writing).[3]

Assyrian attack on a town with archers and a wheeled battering ram; Neo-Assyrian relief, North-West Palace of Nimrud (room B, panel 18); 865–860 BC

The remains of the Roman siege-ramp at Masada

Siege towers were used by the armies of the Neo-Assyrian Empire in the 9th century BC, under Ashurnasirpal II (r. 884 BC – 859 BC). Reliefs from his reign, and subsequent reigns, depict siege towers in use with a number of other siege works, including ramps and battering rams.

Roman siege tower

Centuries after they were employed in Assyria, the use of the siege tower spread throughout the Mediterranean. During the siege of Memphis in the 8th century BC, siege towers were built by Kush for the army led by Piye (founder of the Nubian 25th dynasty), in order to enhance the efficiency of Kushite archers and slingers.[4] After leaving Thebes, Piye's first objective was besieging Ashmunein. Having assembled his army for their lack of success so far, the King then undertook the personal supervision of operations including the erection of a siege tower from which Kushite archers could fire down into the city. [5]

The biggest siege towers of antiquity, such as the Hellenistic Greek Helepolis (meaning "The Taker of Cities" in Greek) of the Siege of Rhodes in 305 BC by Demetrius I of Macedon, could be as high as 40 m (130 ft) and as wide as 20 m (66 ft). Such large engines would require a rack and pinion to be moved effectively. It was manned by 200 soldiers and was divided into nine stories; the different levels housed various types of catapults and ballistae. Subsequent siege towers down through the centuries often had similar engines.

However, large siege towers could be defeated by the defenders by flooding the ground in front of the wall, creating a moat that caused the tower to get bogged in the mud. The siege of Rhodes illustrates the important point that the larger siege towers needed level ground. Many castles and hill-top towns and forts were virtually invulnerable to siege tower attack simply due to topography. Smaller siege towers might be used on top of siege-mounds, made of earth, rubble and timber mounds in order to overtop a defensive wall. For example, the remains of such a siege-ramp at Masada, Israel built by the Romans during the Siege of Masada (72–73 AD) have survived and can still be seen today.

On the other hand, almost all the largest cities were on large rivers, or the coast, and so did have part of their circuit wall vulnerable to these towers. Furthermore, the tower for such a target might be prefabricated elsewhere and brought dismantled to the target city by water. In some rare circumstances, such towers were mounted on ships to assault the coastal wall of a city: at the Roman Siege of Cyzicus during the Third Mithridatic War, for example, towers were used in conjunction with more conventional siege weapons.[6]

One of the oldest references to the mobile siege tower in Ancient China was a written dialogue primarily discussing naval warfare. In the Chinese Yuejueshu (Lost Records of the State of Yue) written by the later Han dynasty author Yuan Kang in the year 52 AD, Wu Zixu (526 BC – 484 BC) purportedly discussed different ship types with King Helü of Wu (r. 514 BC – 496 BC) while explaining military preparedness. Before labeling the types of warships used, Wu said:

Nowadays in training naval forces we use the tactics of land forces for the best effect. Thus great wing ships correspond to the army's heavy chariots, little wing ships to light chariots, stomach strikers to battering rams, castle ships to mobile assault towers, and bridge ships to light cavalry.

— [7]

Sketch of a medieval siege tower

Chinese siege tower

With the collapse of the Western Roman Empire 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:

And in the section from the Polyandrion Gate as far as the Gate of St Romanus he prepared to station twelve lofty siege towers, which were advanced almost as far as the outworks, and he covered them with hides.

— [8]

Medieval English siege tower

At this siege, the attackers also made use mobile armoured shelters known as sows or cats, 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[9]) 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 in 1266, for example, 200 archers and 11 catapults operated from a single tower.[1] Even then, the siege lasted almost a year, making it the longest siege in all of 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.[8]

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 towers and large cannons 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 fifty lighter cannons.[10] Likely, it was a development of the gulyay-gorod (that is a mobile fortification assembled on wagons or sleds from prefabricated wall-sized shields with holes for cannons). Later battery towers were often used by the Ukrainian Cossacks.

A vehicle used by GIGN featuring a mechanical assault ladder mounted on its roof, essentially a modern version of a siege tower

In modern warfare, some vehicles used by police tactical units, counterterrorists, and special forces can be fitted with mechanical assault ladders with ramps. These are essentially modern siege towers with elements of escalade ladders, and are used to raid a structure through its upper levels. These assault ladders are not as large or as tall as their predecessors, and are typically only capable of reaching roughly the third or fourth floor of a structure.

On 1 March 2007, police officers entered Ungdomshuset in Copenhagen, Denmark using boom cranes in a manner similar to siege towers. The officers were placed in containers that the crane operators raised and placed against the structure's windows, from which the officers then entered.[11]