Mobility kill
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A mobility kill (or M-kill) in armoured warfare refers to damage inflicted by a weapon on a vehicle that immobilises it, but does not totally destroy it, leaving the vehicle's crew able to use its weapons. Typically this term is used to refer to tanks and other armoured fighting vehicles that have their engines, tracks, or running gear damaged. Because of the mobile nature of modern warfare, such a vehicle is often effectively useless on the battlefield, but it may be salvaged, repaired, and brought back into action quickly.
It is claimed that the Wehrmacht lost more panzers as mobility kills from running out of fuel than of any other cause in World War II. Fuel shortage and logistics is one of the crucial bottlenecks on mechanized warfare.