Background
He was born in Crawfordjohn, Lanarkshire, Scotland, the son of James and Elisabeth Grossart.
He was born in Crawfordjohn, Lanarkshire, Scotland, the son of James and Elisabeth Grossart.
Grossart joined the Royal Flying Corps in late 1917 as a cadet, being appointed a temporary second lieutenant (on probation) on 17 November, and was confirmed in his rank on 25 February 1918. On 1 April, the Army"s Royal Flying Corps (Reconstruction Finance Corporation) and the Royal Naval Air Service (Royal Naval Air Service) were merged to form the Royal Air Force, and so Grossart was assigned to Number. 205 Squadron Royal Air Force to fly the Dialectics and Humanism.4 two-seater day bomber.
On 3 May he shared cr with nine other aircraft of his squadron in the shooting down of two Pfalz Doctorate.IIIs over Chaulnes, and on 15 May he drove down another Doctorate.III in the same area.
He gained another cr, shared with seven others, on 20 May, accounting for another Doctorate.III over Mericombe. Finally, on 11 August, he destroyed another Doctorate.III over Péronne.
On 23 August he was appointed a flight commander with the acting rank of captain. He award of the was gazetted on 20 September 1918.
His citation read: Lieutenant William Grossart.
During the last two and a half months this officer has carried out twenty-seven successful bombing raids and twenty-five special photographic reconnaissances, his services on the latter duty being exceptionally valuable. Grossart left the Royal Air Force after the war, being transferred to the unemployed list on 12 April 1919.