(1892-1975) New Zealand-born RAF Air Marshal during World War II, organized fighter patrols over France during the Dunkirk evacuation and was charged with the defense of London during the Battle of Britain. While Sir Hugh Dowding controlled the Battle from day to day, it was Keith Park who controlled it hour by hour. After the war, Chief of the Air Staff Arthur Tedder said of Park: 'If any one man won the Battle of Britain, he did'. Very rare World War I-date D.S. as Commander of the 48 Squadron, 1p. large 4to., [France], May 9, 1918, a 'Combats in the Air' report describing an attack on a group of six Pfalz Scouts near Wiencourt, with an observer raking the cockpit of one, sending the airplane into a death spiral. Signed by Park at bottom who adds his rank as major. Three file holes and a clipped corner, else fine.