 From 1943 through 1945, Allum served in the Canadian Forces during World War II, and played for Royal Canadian Navy teams in Winnipeg (while serving with ) and Cornwallis, Nova Scotia; he played with the squad in the 1944 Allan Cup tournament.After the war, he returned to the Bisons, and went on to play for the St. Louis Flyers, Cleveland Barons of the AHL and the Minneapolis Millers of the USHL.After retiring from playing professional hockey in 1948, Allum returned to the senior ranks, and played a number of years for the Owen Sound Mercurys of the OHASL, winning the 1951 Allan Cup.