Siege tower
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A siege tower or breaching tower is a specialized siege engine, constructed to protect assailants and ladders while approaching the defensive walls of a fortification. The tower was often rectangular
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
Medieval English siege tower
A vehicle used by GIGN featuring a mechanical assault ladder mounted on its roof, essentially a modern version of a siege tower
Helepolis
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Helepolis is the Greek name for a movable siege tower.
Siege tower
…could be stowed flat on the deck when not in use, lowering the center of gravity. 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…
Model of a Helepolis siege tower, Thessaloniki Science Center and Technology Museum
Naval helepolis. Two quinqueremes having a helepolis on their decks.