Australian War Memorial Article
The Great Siege

The Siege of Tobruk lasted for 242 days in 1941 from April until December

To read the full story, click on this link to an excellent article at the Australian War Memorial.
Australian troops occupy a front line position at Tobruk. Between April and December 1941 the Tobruk garrison, comprising British, Australian and Polish troops, was besieged by Rommel's forces. It fell to the Germans after the battle of Gazala on 21 June 1942 but was recaptured five months late