Excavators are usually employed together with loaders and bulldozers. Backhoes are usually employed together with loaders and bulldozers. These were equipped with 175 trucks, 65 cranes, 55 excavators and 13 bulldozers. In the initial stage dozens of excavators, bulldozers and other earth-moving equipment prepared the ground. Hydraulic systems use high fluid pressure, such as the hydraulic actuators for bulldozers and backhoes. Helicopter gunships, bulldozers, and artillery bombardment razed the city, killing thousands of people. Teller mines destroyed trucks, DUKWs and five navy bulldozers. The construction, however, is mainly done by small bulldozers and loader tractors. The shrines were destroyed by sledgehammers and bulldozers. The tonnes of explosives packed into these armoured bulldozers are capable of destroying entire buildings. Spaced armour is used on armoured military vehicles such as tanks and combat bulldozers. Firefighters created of fireline by hand and with mechanized equipment such as bulldozers. Workmen pushed them aside with bulldozers and heavy equipment, damaging some spheres. R.G. LeTourneau and Caterpillar manufactured large rubber tired bulldozers. Some ARVs are operated in tandem with armoured bulldozers.