With German support, the lost Libyan territory was regained during Operation Sonnenblume and by the conclusion of Operation Brevity, German and Italian forces were entering Egypt. The first Siege of Tobruk in April 1941 marked the first failure of Rommel's Blitzkrieg tactics. In 1942 there was the Battle of Gazala when the Axis troops finally conquered Tobruk and pushed the defeated British troops inside Egypt again. Defeat during the Second Battle of El Alamein in Egypt spelled doom for the Axis forces in Libya and meant the end of the Western Desert Campaign.