Moat
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A moat is a deep, broad ditch dug around a castle, fortification, building, or town, historically to provide it with a preliminary line of defence. Moats can be dry or filled with water. In some place
Moat at Beaumaris Castle, Wales
North view of the fortress of Buhen in Ancient Egypt.
A medieval moat castle in Steinfurt, Germany
The 17th-century fortified town of Naarden, Netherlands, showing bastions projecting into the wet moat
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