This document discusses ANZAC Day, a national occasion in Australia that marks the anniversary of the first major military action fought by Australian and New Zealand forces during World War I. ANZAC stands for Australian and New Zealand Army Corps, and the soldiers in those forces came to be known as ANZACS. The document references important battles and locations from the Gallipoli campaign, where Australian and New Zealand troops landed on April 25, 1915 and fought against Ottoman Empire forces. ANZAC Day on April 25th is now considered Australia's most important national occasion to commemorate those who fought in wars.