 Complete the following phrase:  It took severe casualties, mainly because of obsolete British tank tactics, especially charging anti-tank guns but finally forced Erwin Rommels Afrika Korps to withdraw to El Agheila in Central Libya. In spring 1942, Rommel had counter-attacked and driven the British back to Gazala, a few miles west of Tobruk. The plan of British Eighth Army Commander Neil Ritchie was to have XIII Corps hold the line, while XXX Corps would stop any attempt to outflank the position south of 