 Complete the following phrase:  In 1914, following the outbreak of the First World War, he took a staff role as assistant quartermaster-general and then assistant adjutant-general with the British Expeditionary Force. Following heavy fighting, he was assigned to 6th Division on 1 October as its assistant adjutant-general and quartermaster-general, succeeding Walter Campbell. He remained with the division until February 1915, handing over his post to Reginald May. OGowan was then transferred to a field command, taking over the 13th Brigade in the 5th Division. The brigade was temporarily attached to 28th Division at this time, and involved in defending against a heavy German attack at St. Eloi on 14 March, and the successful 