After being educated at
The King's School, Canterbury and attending the
Royal Military College, Sandhurst, Fanshawe was commissioned into the
Queen's Bays in 1914 and saw service in France,
Palestine,
Mesopotamia,
Persia, Russia and Syria during the
First World War; among his assignments during this period was
Aide-de-camp to his father, who was
General Officer Commanding the British Cavalry Corps (1915). From 1915 to 1919 he was seconded to the
Royal Flying Corps. Fanshawe returned to his regiment as
adjutant in 1919. In 1939 he was appointed commander of the
20th Armoured Brigade and, following promotion to major general, he was appointed commander of the
Royal Armoured Corps Training Establishment from 1942 to the end of the war. ==Later career==