 Often incorporated into subways were light rail lines, hospitals, command posts, water reservoirs, ammunition stores, mortar and machine gun posts and communication centres.The Germans dug a number of similar tunnels on the Vimy front, to provide covered routes to the front line and protection for headquarters, resting personnel, equipment, and ammunition.The Germans also conducted counter-mining against the British tunnellers and destroyed a number of British attempts to plant mines under or near their lines.