http://www.theaerodrome.com/forum/showthread.php?t=55880 The Aerodrome Forum] His greatest month was May 1917, when he downed seven German aircraft including a quadruple on 25 May. theaerodrome.com, 29 April 2010 Picture of Guynemer with machine guns from his 44 and 45 Victories 5 June 1917 By July, he began to fly the Spad XII; his avion magique was, at his behest, armed with a 37 mm cannon whose barrel fired through the propeller shaft.