Rommel's success at Tobruk worked against him, as Hitler no longer felt it was necessary to proceed with Operation Herkules, the proposed attack on Malta. Auchinleck relieved Ritchie of command of the Eighth Army on 25 June, and temporarily took command himself. Rommel knew that delay would only benefit the British, who continued to receive supplies at a faster rate than Rommel could hope to achieve. He pressed an attack on the heavily fortified town of Mersa Matruh, which Auchinleck had designated as the fall-back position, surrounding it on 28 June. The fortress fell to the Germans on 29 June. In addition to stockpiles of fuel and other supplies, the British abandoned hundreds of tanks and trucks. Those that were functional were put into service by the Panzerwaffe.