While most of the 6th Division returned to Egypt, the 19th Brigade Group and two provisional infantry battalions landed on Crete, where they formed a key part of the island's defences. The 19th Brigade was initially successful in holding its positions when German paratroopers landed on 20 May, but was gradually forced to retreat. After several key airfields were lost the Allies evacuated the island's garrison. Approximately 3,000 Australians, including the entire 2/7th Infantry Battalion, could not be evacuated, and were taken prisoner. As a result of its heavy casualties the 6th Division required substantial reinforcements and equipment before it was again ready for combat. "Perth" and the new destroyers and also took part in operations around Crete, with "Perth" embarking soldiers for evacuation to Egypt.