Russell joined the Middlesex Hospital when only sixteen years of age and it was while he was in London that he joined the University of London Officers Training Corps, obtaining a commission in the Royal Welch Fusiliers in 1914. He was with them in camp when war was declared. Being anxious to qualify, he was seconded in order to complete his medical studies. After obtaining his degrees, he joined the Royal Army Medical Corps and was attached to a battery of the Royal Field Artillery. He later re-joined his old regiment R.W.F 1st/6th Battalion (Anglesey and Caernarvonshire) and went out to Egypt as medical officer.
