Hoare's first military experience came when he was
commissioned into the 1st
Hampshire Royal Garrison Artillery,
Volunteer Force, as a
second lieutenant on 6 December 1902; he later transferred to the
Lancashire Royal Garrison Artillery. He then
emigrated to
New Zealand where he stayed for several years before working his passage home via
Valparaíso where he collected some
polo ponies for delivery to the
United Kingdom. He transferred to the
Auxiliary Patrol on 27 November 1914, and was promoted
lieutenant on 7 October 1915. In 1917 and early 1918 he made several applications for transfer to the
submarine service or to larger craft: these were all refused. On 12 April 1918, the engine room of HM Motor Launch 356 exploded at
Dunkirk quay, after a collision with another vessel, and the forward petrol tanks burst into flames. Several of the launch's crew were blown overboard by the explosion, while the remainder were driven off by the fire. Flames soon began to issue forth from the cabin, and burning petrol spread on the surface of the water. As others proceeded to flee the scene, Hoare, along with Lieutenant
Arthur Bagot, realised the fire was threatening the
aft petrol tanks and the
depth charges located on board the launch. Jumping in a dinghy, the pair rowed out towards the blaze. On reaching the wreck, Hoare and Bagot removed the depth charges despite the flames; thus preventing any further explosion. His acting rank was also confirmed as a further reward for his success in this operation. for which he received a
Mention in Despatches and a
Bar to his DSO on 28 August. He was given his AM and the Bar to his DSO in a further investiture soon after. and on 8 March 1919. Hoare was demobilised on 24 September 1919. ==Later life==