Portal:Military history of Australia/Selected anniversaries/May/May 11
- 1945 – World War II: the 6th Division captured Wewak, New Guinea in a combined amphibious and land assault. Its capture marked the beginning of the end of the Aitape–Wewak campaign.
- 1969 – Vietnam War: Ray Simpson is awarded a VC for actions in the Kon Tum Province, Vietnam.