The initial force commenced its first operations in North Africa, and the war, with the Operation Compass offensive; beginning with the Battle of Bardia.[1][17] This was followed by the supply of Australian units to Greece to defend against the Axis forces, which ultimately failed and a fighting withdrawal was issued.[18] Australian troops landed in Crete after the evacuation of Greece to defend against further aggression, which was more successful but still failed and another withdrawal was ordered.[19] During this period the Allies were pushed back to Egypt and Tobruk came under siege by the Germans, with the primary defence personnel being Australians of the 9th Division; they lasted for 241 days.[20]