In September 1944 Johnson's wing participated in support actions for Operation Market Garden in the Netherlands. On 27 September 1944, Johnson's last victory of the war was over Nijmegen. His flight bounced a formation of nine Bf 109s, one of which Johnson shot down. During this combat Squadron Leader Henry "Wally" McLeod, of the Royal Canadian Air Force, and his squadron had joined Johnson. During this action McLeod went missing, possibly shot down by Siegfried Freytag of "Jagdgeschwader" 77 (Fighter Wing 77).