When did Ypres start and end?

The Ypres Salient, a significant battleground during World War I, was primarily active from 1914 to 1918. The First Battle of Ypres took place in October and November 1914, followed by the Second Battle in April to May 1915, and the Third Battle from July to November 1917. The area saw continuous fighting throughout the war, with major offensives and defensive actions occurring until the armistice in November 1918.