September 29, 1917
Richthofen and Guynemer? No.
"On 11 September, Guynemer left his base in a Spad XIII S 504 to carry out a patrol of the Langemark area. After nearly an hour into the flight he saw a German...
Fighter Aces of the Great War, Stephen & Tanya Wynn, Pen&Sword Books, 2020
"On 11 September, Guynemer left his base in a Spad XIII S 504 to carry out a patrol of the Langemark area. After nearly an hour into the flight he saw a German...