
In 1899 Otter was the obvious choice to lead the first Canadian contingent in the South African War. His austere professionalism was unpopular with subordinates but contributed to Canadian prestige. In 1908 he was the first Canadian-born chief of the general staff and was inspector general of the Canadian Militia 1910-12, when he retired. He commanded internment operations during the First World War. Otter was knighted in 1913 and in 1922 became the second Canadian soldier, after Sir Arthur Currie, to reach the rank of general.