According to his attestation papers dated August 16, 1915 at Toronto, Henry Harry Rose was born in Mimico on February 19, 1889. He listed his wife Mrs. Lavinia Rose, Mimico as his next of kin. He was a blaster by trade and indicated that he had no previous military experience. He was 26 years and 5 months of age and stood 4 feet 7 inches tall. He had brown eyes and hair and a dark complexion. He was a member of the Church of England.
In the 1914 Toronto City directory his occupation is listed as well driller living on the north side of Symons Street, Mimico. He was still living at the same location in the 1921 Toronto City directory.