"Bill" Green was commissioned a second lieutenant in August 1917. He completed training and was posted to 57 Squadron on 29 September 1917. He scored his first aerial victory on 6 January 1918. On 2 July 1918, Green was promoted to temporary captain. On a bombing run that 20 July, the eve of the Second Battle of Bapaume, his flight encountered the combination of blinding rain and Pfalz D.III scouts. He afterwards wrote to Dr. Joseph Kirkland, the father of Lieut. James Tweeddale Kirkland:
... About Kirkland and Riley, what happened was this: They were on a bomb raid which I was leading. The weather was very bad, and we had been followed around by Pfalz scouts. Just as we got to the objective and had dropped our bombs, a thunder storm burst right on top of us. The rain which followed absolutely blinded every one of us, with the result that the formation got split up. I eventually collected a few of them, and having seen them across the lines, I waited for about ten or fifteen minutes, but seeing nothing I came home to find that Kirkland had not arrived. Later on we got a report through from the line that he had been seen going down over Hunland with the Huns following. Probably his engine was hit, or something like that. We are extremely sorry as he was such a topping fellow and awfully stout, and Riley no less so.
On 29 August 1918, Green scored his eighth win, only to be seriously shot about by a Fokker biplane; however, both he and his observer escaped unscathed. He scored his final win on 19 September 1918, having scored his nine victories incidental to his duties as an Airco DH.4 pilot. His Distinguished Flying Cross was gazetted after the armistice ended World War I, on 3 December 1918. The citation makes no mention of his acedom.
A skilful, courageous pilot and a brilliant leader, conspicuous for his sound judgment. No difficulties daunt him, and he has never failed to carry out any task that he may have been set. He sets a splendid example to the whole squadron.
List of aerial victories
Post World War I
On 3 February 1920 Green went on the unemployed list and surrendered his commission in the Royal Air Force upon appointment into the British Territorial Force. On 9 April 1921, he was promoted temporary captain in 5th Battalion, Northamptonshire Regiment. However, shortly thereafter, on 17 July 1921, he relinquished his commission, retaining rank as captain. He obviously returned to duty, as on 10 November 1928 he was promoted to major. On 10 November 1934, he was promoted to lieutenant colonel. On 24 June 1938 Green was still a lieutenant colonel in the 5th Battalion, Northamptonshire Regiment. On 10 November 1938 he was promoted to colonel of battalion. Green died on 23 May 1940 in the days before the evacuation from Dunkirk, his battalion was withdrawing across Flanders in a fighting retreat following the German advances in the Low Countries. He is buried at White House Cemetery near Ypres in Belgium. His uniform, medals and sword are held by the Norris Museum in St. Ives.
