The Allies began their amphibious assault on the Gallipoli Peninsula on the European side of the Dardanelles the following day. The troops were able to land, but could not dislodge the Ottoman forces even after months of battle that caused the deaths of an estimated 131,000 soldiers, and 262,000 wounded. Eventually they withdrew. The campaign represented something of a coming of age for Australia and New Zealand, who celebrate 25 April as ANZAC Day. Kemal Atatürk, who later became the first leader of modern Turkey, distinguished himself as a lieutenant colonel at Gallipoli.