21 January
1941— Australian 6th Division troops began the attack on Tobruk, Libya. HMA Ships Stuart, Vampire, and Voyager were also involved in the attack.
1942— Japanese submarine I-124 is sunk by HMAS Deloraine in the Arafura Sea, the first Japanese warship to be sunk by the RAN in the Second World War.
1965— Following a formal request for assistance by the Malaysian Government, the Australian commits 3RAR to the Indonesian Confrontation.