Britain's Queen Elizabeth lays a wreath during a service to commemorate Anzac Day and the centennial of the Battle of Gallipoli at the Cenotaph war memorial in central London on Saturday, April 25. A century ago, Allied troops came ashore at Gallipoli in modern Turkey at the start of an ill-fated land campaign to take the Dardanelles Strait from the Ottoman Empire. The disastrous World War I battle began on April 25, 1915, and pitted troops from Australia, Britain, France and New Zealand against the Ottoman forces backed by Germany.
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New Zealand Defense Minister Gerry Brownlee and Australian Foreign Minister Julie Bishop observe the centennial of the WWI Gallipoli campaign at Polygon Wood in Zonnebeke in Ypres, Belgium.
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Indigenous dancers lead the parade through Redfern toward Alfred Park as part of the Redfern Aboriginal Anzac Day Commemoration in Sydney, Australia. The day is named for the Australian and New Zealand Army Corps, which suffered heavy losses during the protracted Gallipoli campaign.
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A large crowd gathers around the eternal flame for the 2015 dawn service on Anzac Day at the Shrine of Remembrance in Melbourne, Australia.
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A man places a poppy on the Roll of Honor at the Australian War Memorial in Canberra, Australia.
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Britain's Prime Minister David Cameron, left, and George Henry Brandis, attorney general for Australia, carry wreaths during a ceremony at the Cenotaph in Whitehall, London,
Servicemen and women march wearing period uniforms at the Australian War Memorial in Canberra, Australia.
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A marching band takes part in the Anzac Day parade along George Street in Sydney, Australia.
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A poppy is laid on the Tomb of the Unknown Warrior during the Anzac dawn ceremony at Pukeahu National War Memorial Park in Wellington, New Zealand. For the allies, Gallipoli was considered a military failure, though the bravery of Australian and New Zealand troops has long been celebrated.
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Members of the Albert Battery shoot a volley during the Currumbin RSL dawn service in Currumbin, Australia.
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People pin poppies to the Cenotaph following the dawn service at the Auckland War Memorial Museum in Auckland, New Zealand.
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The Anzac torch is lit at the Shrine Of Remembrance at Melbourne Cricket Ground on April 24, in Melbourne, Australia.