Portal:Military history of Australia/Selected anniversaries/April/April 18
- 1941 – World War II: The Australian 2/2nd and 2/3rd Battalions and New Zealand's 21st Battalion stem the German advance in Greece in a rearguard action that enabled the main Allied force to withdrawal to defensive lines.
- 1942 – World War II: General Thomas Blamey is appointed Commander Land Forces, South West Pacific Area.