Frank enlisted on 5th July 1915 and was posted to No 6 Coy. He was 19 years and 9 months old, was a dispenser by trade, and was living in Kington Hertford at the time. In October 1915 he was diagnosed as suffering with heart problems, and as a consequence completed his war service in the UK. He was promoted to the rank of acting corporal, without pay, on 10th January 1918, then with pay from 7 months later on 19th July. He was transferred to Class Z, Army Reserve on 14th March 1919.