Anzac Day marks the anniversary of the first major military action fought by Australian and New Zealand forces during the First World War.[1] The acronym ANZAC stands for Australian and New Zealand Army Corps, whose soldiers were known as Anzacs. Anzac Day remains one of the most important national occasions of both Australia and New Zealand.[2] This is a rare instance of two sovereign countries not only sharing the same remembrance day, but making reference to both countries in its name.

When war broke out in 1914, Australia had been a Federal Commonwealth for only thirteen years. In 1915, Australian and New Zealand soldiers formed part of an Allied expedition that set out to capture the Gallipoli Peninsula, under a plan by Winston Churchill to open the way to the Black Sea for the Allied navies. The objective was to capture Istanbul, capital of the Ottoman Empire and an ally of Germany. The ANZAC force landed at Gallipoli on 25 April, meeting fierce resistance from the Turkish Army commanded by Mustafa Kemal (later known as Atatürk). What had been planned as a bold strike to knock Turkey out of the war quickly became a stale-mate, and the campaign dragged on for eight months. At the end of 1915, the Allied forces were evacuated after both sides had suffered heavy casualties and endured great hardships. Over 8,000 Australian and 2,700 New Zealand soldiers died. News of the landing at Gallipoli made a profound impact on Australians and New Zealanders at home and 25 April quickly became the day on which they remembered the sacrifice of those who had died in war.

Though the Gallipoli campaign failed in its military objectives of capturing Istanbul and knocking Turkey out of the war, the Australian and New Zealand troops' actions during the campaign bequeathed an intangible but powerful legacy. The creation of what became known as an "Anzac legend" became an important part of the national identity in both countries. This shaped the ways their citizens viewed both their past and their future.

The date, 25 April, was officially named Anzac Day in 1916; in that year it was marked by a wide variety of ceremonies and services in Australia and New Zealand, a march through London, and a sports day for the Australian and New Zealand soldiers in Egypt. The small New Zealand community of Tinui, near Masterton in the Wairarapa was apparently the first place in New Zealand to have an Anzac Day service, when the then vicar led an expedition to place a large wooden cross on the Tinui Taipos (a 1,200 ft (370 m) high large hill/mountain, behind the village) in April 1916 to commemorate the dead. A service was held on 25 April of that year.[4] In 2006 the 90th anniversary of the event was commemorated with a full 21-gun salute fired at the service by soldiers from the Waiouru Army Camp.