WWI Battle Locale includes Ypres, a Belgian city located in the province of West Flanders, which was the site of three major battles during World War I. The Battle of Ypres was fought from April 22 to May 25, 1915 and was the first major battle fought by the Canadian Corps. The Second Battle of Ypres was fought from April 22 to May 25, 1915 and was the first major use of poison gas on the Western Front. The Third Battle of Ypres was fought from July 31 to November 10, 1917 and was the largest and most costly battle of the war for the British Empire. Another WWI Battle Locale is the Argonne Forest, a large forested area in northeastern France that was the site of the Meuse-Argonne Offensive, the largest and bloodiest battle of World War I. The Meuse-Argonne Offensive was fought from September 26 to November 11, 1918 and was the final Allied offensive of the war. Finally, the Marne River is another WWI Battle Locale. The First Battle of the Marne was fought from September 6 to 12, 1914 and was the first major battle of the war. The Second Battle of the Marne was fought from July 15 to August 6, 1918 and was the last major German offensive of the war.