 Complete the following phrase:  Following the outbreak of war, Young was found medically unfit for overseas service and had to undergo an operation. In January 1915 he was passed fit and was posted with a reinforcement draft to 11st battalion Hertfordshire Regiment, then serving as part of the British Expeditionary Force on the Western Front. His father had rejoined the army and was serving as the battalions Regimental Sergeant Major. Both father and son saw service through successive engagements in 1915, including the 