http://www.warbirdsresourcegroup.org/LRG/hanstate.htmlMuch of the debate and refusal to substantiate Marseille's combat record originates from one day of furious air combat on 1 September, 1942 in which he claimed to have destroyed 17 aircraft in three sorties. Not only did Marseille claim 17 aircraft, but he did it in a fashion that was unheard of at the time. His victims were shot out of the sky in such a rapid fashion that many Allied critics still refuse to believe Marseille's claims as fact. But it is precisely the speed and fury involved with these kills that has been the center of the Marseille debate for the past half century. For years, many British historians and militarists refused to admit that they had lost any aircraft that day in North Africa. Careful review of records however do show that the British did lose more than 17 aircraft that day, and in the area that Marseille operated. The British simply refused to believe, as many do today, that any German pilot was capable of such rapid destruction of RAF hardware.
Facts are that Marseille is still acknowledged as among the best marksmen in the Luftwaffe. The Germans were very meticulous in filing combat reports with all relevant data to include time of battle, area of operation, opposition encountered, as well as an in-depth armorers report. At the end of a mission, the armorers would count the number of bullets and cannon shells expended during the fight. Marseille would often average an astonishing 15 bullets required per victory, and this with a combat resulting in his downing of several allied aircraft. No other German pilot was close to Marseille in this area.
http://www.2worldwar2.com/marseille.htmMarseille said that in such conditions, there's a lower chance and too little time for the usual chase attack method, and preferred to use high angle deflection firing from short range while making a sharp turn. In doing so, he never used his gun sight and instead fired a very short burst at the passing target in the split second when its leading edge, its propeller, disappeared from his eyes behind his aircraft's nose.