On 29 October 1941 Fenbury joined the Australian Imperial Force, where he was commissioned lieutenant and posted to the Australian New Guinea Administrative Unit, during this period he led geurrilla operations, reconnaissance, and fighting patrols in Japanese-held territories.
May enlisted in the Australian Imperial Forces (AIF) during World War II, and he was killed in New Guinea.
In 1943, the 6th, 7th and 9th Divisions were reunited on the Atherton Tableland.
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He was born in Melbourne and attended Caulfield Grammar School, and served with the Australian Imperial Force in World War II.
He served in the Australian Imperial Force and the Royal Australian Air Force during World War II, but later returned to zoology, qualifying as a Doctor of Philosophy in 1956, and becoming a Professof of Zoology in 1967.
He served in the 2nd Australian Imperial Force 1940–45, rising to the rank of lieutenant and serving in Darwin, Morotai and Borneo.