MacIlwaine was born in
Sculcoates, Kingston upon Hull, and attended
Clifton College. A forward, MacIlwaine played his club rugby for Harlequins and Hull & East Riding. He also featured in services rugby and represented Yorkshire at county level. In 1912, MacIlwaine gained four of his five
England caps. MacIlwaine served as an officer with the
Royal Field Artillery in World War 1, during which he was decorated with both the
Military Cross and
Croix de Guerre (with Palm) for gallantry. In 1920, MacIlwaine was recalled by England for a match against
Ireland at Lansdowne Road. MacIlwaine immigrated to
Rhodesia. ==See also==