Tanks and other armoured fighting vehicles can be immobilized by damage to their engines, tracks, or running gear.
Because of the mobile nature of modern warfare, such a vehicle is often effectively useless on the battlefield, though it may later be salvaged for spares, or repaired and brought back into action.
In rare cases, tanks that have suffered mobility kills have continued to engage enemy targets with their main gun, even though they are immobile.
However, in an active battlefield situation any armoured fighting vehicles which have suffered mobility kills are stationary targets for ground-attack planes armed with ordnance such as rockets or cluster bombs.
In any case, enemy ground troops may attack stranded vehicles with additional ATGMs or RPGs.