sentences:  In February 1917, during World War I, Duguid sailed for Egypt as a captain in the Royal Australian Army Medical Corps, as part of the First Australian Imperial Force.He first worked in the Middle East, treating casualties in the Australian Light Horse, and then on a hospital ship before leaving the service in October 1917.He wrote two books about his experiences, before returning to Scotland in 1919 for post-graduate study and to earn his surgical fellowship.