 He was posted, along with several other Duntroon graduates who had been invalided home, to Duntroon, as an instructor at the Officers' Training School.This was closed in June 1917 and Rowell was posted to the staff of the 4th Military District in Adelaide.On 20 August 1919 at the Chalmers Church, North Terrace, Adelaide, Rowell married Blanche May Murison, the daughter of a Scottish engineer.