The Siege of Tobruk lasted for 241 days in 1941, after Axis forces advanced through Cyrenaica from El Agheila in Operation Sonnenblume against the British Western Desert Force (WDF) in Libya, during the Western Desert Campaign (1940–1943) of the Second World War. In late 1940, the British had defeated the Italian 10th Army during Operation Compass (9 December 1940 – 9 February 1941) and trapped the remnants at Beda Fomm. German troops and Italian reinforcements reached Libya, while much of the WDF was sent to Greece and replaced by a skeleton force, short of equipment and supplies.