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Anti-tank trenches, also called anti-tank ditches, are ditches dug into and around fortified positions to hold up the advance of enemy tanks. Anti-tank ditches were first used in World War I by Germany in an effort to protect their against the newly developed British and French tanks. An anti-tank ditch has to be wide enough and deep enough to prevent a tank from crossing. Armies have been known to disguise anti-tank ditches to enable the ditch to disable an enemy tank. Anti-tank trenches can be defeated by use of a fascine. Anti-tank ditches can also be crossed by use of bridges either laid by armoured vehicles or built over them, they can also be defeated by demolition of each side, using explosives, to make inclines that can be crossed or can be filled in by earth moving equipment.
According to the United States Army, there are several methods by which can dig an anti-tank ditch on the battlefield. Using only hand tools, a platoon of soldiers can dig a triangular-shaped ditch long, wide and deep in seven and a half hours; a trapezoidal-shaped ditch of similar dimensions would take fourteen hours. Equipping the platoon with a Excavator cuts these digging times to four and a half hours and nine hours respectively. Alternatively, a squad of soldiers with a Earth auger and sufficient demolition charges can blast a ditch long, wide and deep in twelve hours.
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