Some serious discrepancies between Allied squadron records and German claims have caused some historians and Allied veterans to question the accuracy of Marseille's official victories, in addition to those of "JG 27" as a whole. Attention is often focused on the 26 claims made by "JG 27" on 1 September 1942, of which 17 were claimed by Marseille alone. A USAF historian, Major Robert Tate states: "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 [and South Africans did lose more than 17 aircraft that day, and in the area that Marseille operated." Tate also reveals 20 RAF single-engined fighters and one twin engined fighter were destroyed and several others severely damaged, as well as a further USAAF P-40 shot down. However, overall Tate reveals that Marseille's kill total comes close to 65–70 percent corroboration, indicating as many as 50 of his claims may not have actually been kills. Tate also compares Marseilles rate of corroboration with the top six P-40 pilots. While only the Canadian James Francis Edwards' records shows a verification of 100 percent other aces like Clive Caldwell (50% to 60% corroboration), Billy Drake (70% to 80% corroboration), John Lloyd Waddy (70% to 80% corroboration) and Andrew Barr (60% to 70% corroboration) are at the same order of magnitude as Marseille's claims. Christopher Shores and Hans Ring also support Tate's conclusions. British historian Stephen Bungay gives a figure of 20 Allied losses that day.