WWI First Battle of Passchendaele Barrage Map - A-Day - Declassified - 1917

The First Battle of Passchendaele took place on 12 October 1917 during the First World War, in the Ypres Salient on the Western Front. The attack was part of the Third Battle of Ypres and was fought west of Passchendaele village. The British had planned to capture the ridges south and east of the city of Ypres as part of a strategy decided by the Allies at conferences in November 1916 and May 1917. Passchendaele lay on the last ridge east of Ypres, 5 mi (8.0 km) from the railway junction at Roulers, which was an important part of the supply system of the German 4th Army. The battle was a German defensive success but was mutually costly and two German divisions were diverted to Flanders to replace "extraordinarily high" losses. In the worst weather conditions of the campaign, in the five weeks after the Battle of Broodseinde, the number of troops engaged by the British amounted to no more than those involved in the Battle of Pilckem Ridge on 31 July. British losses in October 1917 were the third highest of the war, after July 1916 and April 1917.