Arthur entered the war in France on 13th August 1914, as part of the Regimental Medical Officer's team for the 2nd Bn. Royal Munster Fusiliers. His name appears on a list of R.A.M.C. personnel who were taken captive up to & including 31st December 1914 - (kindly provided by Steve Mattocks). He was taken to the German prisoner of war camp Sennelager on 12th September 1914.