During the First World War, he acted as principal surgeon in an Anglo-Russian hospital set up in Russia to help the army on the Eastern front. He received a knighthood in 1917 in recognition of his war services.
Personal life
In 1892 he married Edith Florence, who died in 1929, and was survived by two daughters.
Death
Waterhouse died at his home in London on 23 May 1931.