Dear Stephen and Barrett,
The letter published in BARKER VC is a transcription of an original contained on microfilm in the National Archives of Canada Personnel Records Centre, ie, Barker's Canadian Forces military files.
Johnston states that Barker told him that there were fifteen Huns below him after he shot down the two-seater.
The numbers cited in the combat report and VC citation may have been calculated using eye witnesses, but the identity of those witnesses are not recorded in any documents that I have been able to find.
Barrett's observations re-Medal of Honor citations can certainly be reinforced by similar difficulties with Victoria Cross citations. The best example of what Barrett notes on the VC side is the citation for
Alan Jerrard, 66 Sqn, Italy, March 1918. It does not accord with what actually happened and Jerrard played no part in the content of the citation.
A recent biography of Medal of Honor recipient Gregory Boyington (Bruce Gamble's Black Sheep One) shines a lot of light on the issue of victory scores, medals, and citations, albeit WWII, not WWI.
The awarding of gallantry medals is very much a political process and it is naive to think it is or indeed could be otherwise.
Wayne Ralph, author, BARKER VC