Churchill tank
Military forces require such vehicles to clear obstacles, fortifications and rubble so that they can safely advance. Military engineers may use a variety of specialised vehicles including armoured bulldozers and explosive robotic drones. Examples used during the Second World War include the German Goliath, the AVRE variant of the Churchill tank and the Centaur bulldozer. The Israel Defence Forces developed armoured bulldozers such as the IDF Caterpillar D9 in the 1950s and has used these with success in several of its conflicts.