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Britain and its Empire lost almost a million men during World War One; most of them died on the Western Front. Stretching 440 miles from the Swiss border to the North Sea, the line of trenches, dug-outs and barbed-wire fences moved very little between 1914-1918, despite attempts on both sides to break through. Pinpoint key locations along the Western Front, watch the general movements of both sides and view the battles of Ypres, Verdun and the Somme in more detail.