Sidney resided at 106 Wood Street Kettering. He enlisted on the 9th July 1915 with the 1st Home Counties Field Ambulance T. F. He was sent to France on the 23rd January 1917 and arrived in France on the 24th January 1918 and served with the 2/1st Home Counties Field Ambulance. In January 1918 whilst playing football in the snow he fell and sprained his knee!