Wavell was working as a staff officer when the First World War began. As a captain, he was sent to France to a posting at General HQ of the British Expeditionary Force as General Staff Officer Grade 2 (GSO2), but shortly afterwards, in November 1914, was appointed brigade major of 9th Infantry Brigade. He was wounded in the Second Battle of Ypres of 1915, losing his left eye and winning the Military Cross. In October 1915 he became a GSO2 in the 64th Highland Division.