BRITAIN-HISTORY-WWI-GALLIPOLI

British Prime Minister David Cameron (L) and his wife Samantha Cameron arrive at Westminster Abbey for a service to commemorate ANZAC day and the centenary of the Battle of Gallipoli in central London on April 25, 2015. A century ago, Allied troops waded ashore on the Gallipoli peninsula at the start of an ill-fated land campaign to wrest the Dardanelles Strait from the Ottoman Empire. The disastrous World War I battle began on April 25, 1915, and pitted troops from countries including Australia, Britain, France and New Zealand against the Ottoman forces backed by Germany. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP via Getty Images)