Queen Elizabeth II (C), her husband, Prince Philip, Duke of Edinburgh (L) and Prince William, Duke of Cambridge (R), attend a commemorative ceremony marking the centenary of the Gallipoli campaign on April 25, 2015 in London, England. The Gallipoli land campaign, in which a combined Allied force of British, French, Australian, New Zealand and Indian troops sought to occupy the Gallipoli peninsula and the strategic Dardanelles strait during World War I, began on April 25, 1915 against Turkish forces of the Ottoman Empire. The Allies, unable to advance more than a few kilometers, withdrew after eight months. The campaign cost the Allies approximately 45,000 killed and up to 200,000 wounded, the Ottomans approximately 85,000 killed and 160,000 wounded.