The Battle of Passchendaele, also known as the Third Battle of Ypres, took place from July to November 1917 during World War I. It was fought between the Allied Forces, primarily the British Empire, and the German Army. The battle aimed to capture the ridges around the town of Passchendaele in Belgium to improve the Allies' position and gain control of the German submarine bases. The battle is infamous for its horrific conditions, including heavy rain that turned the battlefield into a quagmire. Despite significant casualties on both sides, the Allies advanced only a few miles. The battle resulted in over 500,000 casualties, making it one of the war's bloodiest confrontations.