I've never agreed with that argument, but it's also become less plausible over time. When these discussions first came up, I was quoting mainly Alfred Price's little Osprey book "Spitfire Mark V Aces" and a now defunct website using the same Japanese source, private monograph written for a Western reserarcher by retired Japanese officer (postwar officer, JASDF or JMSDF I dont' recall). But since then Baeza's "Solelil Levant sur l'Australie" came out, and what's more, many original records of the JNAF are now online at the National Archives of Japan website, 'JACAR'. The records of 23rd Air Flotilla say the 202nd Air Group was the only fighter unit on the navy's raids on Australia, and the 202nd's own 'kodochosho' or 'tactical operation records', at JACAR, detail each mission where the Spitfires reported meeting Zeroes (except the single mission by Army Type 1's, June 20). They do not reference any other unit (fighter kodochosho on multi-unit missions in Solomons and New Guinea *do* refer to the other units present), and the 753rd AG's (the 'Betty' unit in all the Navy raids) kodochosho also lists the 202nd, only, as their escort on the escorted bombing raids.I think the main problem is that not all the participating IJN and JAAF units are identified in Joes accounts.
With the detail of these sources, there is no longer any plausible argument that Spitfire overclaims against Zeroes represent losses by unknown Japanese units. Saying that's 'not certain' is about the same as saying the Zero overclaims for Spitfires are explained by unknown additional Spitfire units. Show absolute proof other Spitfire units weren't flying from Darwin besides the known ones… it's about the same kind of argument, at this point.
The Spits caused the following loss and damage to Zeroes in the Darwin raids, taken directly from the 202nd's kodochosho except as in ( ), Japanese names are family name first, I didn't bother figuring out the (scribbled) given names in some cases of minor damage, and Japanese names can often have more than one pronunciation which even native speakers can't disambiguate 100% certainly from seeing them written in Chinese characters as in these records:
March 2 1943: 21 Zeroes on escort to Taban (?Coomali), a/c of Sea 1C Hihara Hiroyuki (日原弘行) hit 3 times, a/c of PO2C Tsuda Goro (津田五郞) hit twice. JACAR document: C08051650100 pp 1-2
March 15: 27 Zeroes to Darwin on escort, one mechanical abort, PO2C Tajiri Seiji went missing, no damage to other a/c, C08051650100, pp. 49-50
May 7: 27 Zeroes to Darwin on escort, one mechanical abort, CPO Noda Teruomi(?, 野田光臣)'s a/c was holed 7 times but returned (Price mistakenly reports this as 7 Zeroes hit) C08051650700 pp. 8-9
May 10: 9 Zeroes to Stewart Field on strafing mission. PO1C Sakai Kunio went missing (crashed on Stewart field); CPO Yamanaka Tadao ditched (Baeza has a photo of a Zero leaving the area streaming fuel, taken from the ground); the leader Ens Miyaguchi Morio's a/c had a fire but 'use possible' (repairable); PO1C Yoshida's a/c was hit once. (Spitfire claims in this one case were quite accurate, 2 destroyed 1 probable) C08051650700 pp. 46-47
May 28: 7 Zeroes to Stewart Field on escort. a/c of PO2C Nishi hit once, that of [illegible] also damaged. C08051650900 pp. 43-44
June 20: (this raid was by the JAAF, suffered one Type 1 Fighter loss in 59th Sentai, per numerous sources)
June 28: 27 Zeroes to Darwin on escort, CPO Noda's a/c was hit once (see May 7), that of PO2C Okubo Noto (?大久保野藤) 6 times, that of Sea 1C Hasegawa Shujiro 10 times, latter two a/c classed 'medium damage, use possible'; one pilot was seriously wounded, probably Okubo since he didn't fly the next mission and the other two did; all three were in the same 3 plane 'shotai'. C08051651300 pp. 18-19
June 30: 27 Zeroes to Fenton a/f on escort, no loss or damage. C08051651300 pp. 29-30
July 6: 27 Zeroes to Fenton a/f on escort, CPO Ishikawa Tomotoshi mechanical abort, a/c of PO2C Hayashi Takeshi (林武?) hit 4 times, a/c of WO Sakaguchi Otojiro (坂口音次郎) hit once (this is slighty at odds with Baeza who says Tomotoshi's a/c was damaged in combat and landed wheels up, not what the report seems to say, but Baeza's info is also that only 26 a/c completed the mission and two were combat damaged) C08051651300 pp. 48-49
Sept 7: 36 Zeroes on escort of Army a/c (2 Type 100 Hq. Recon, 'Dinah'), PO1C Terai Yoshio went missing, a/c of PO2C Shimazu Masao (島津正雄) was hit 7 times, a/c of PO1C Goto Koichi (後藤庫一) hit 5 times, a/c of Ens. Miyaguchi Morio hit twice, a/c of Sea 1C Ishida hit once. C08051651700 pp. 3-4
So in total, 3 pilots were lost with their Zeroes, one Zero ditched pilot survived, and 15-16 other Zeroes (not clear if Miyaguchi's fire May 10 was due to combat) suffered repairable combat damage. Note that all the Zero losses were not 100% certainly caused by Spitfires, only the May 10 losses, Sakai and Yamanaka's ditching, were pretty certainly due to Spits, assuming ground fire didn't punch a hole in Yamanaka's fuel tank during the strafe. The other two (Mar 15, Sep 7) just disappeared during/after combat with Spits, probably downed by Spits, but the uncertainty is worth keeping in mind if one would quibble about whether certain Spit losses on these missions were 100% certainly due to Zeroes.
I think it's useful to list the damaged Zeroes, because it gives a better idea how the Spit overclaims could be so high. The kodochosho for other campaigns also show that Zeroes frequently made it back long distances to base with damage, even fairly well shot up. One factor in Allied overclaims might have been their belief that any Zero they hit was as good as dead, so when sure they hit a Zero, perhaps convinced themselves that they saw a dramatic end to the Zero they didn't really see, or felt it wasn't exaggerating to say so even when they knew they hadn't really seen it, because the Zero wasn't going to regain its base anyway…but they often did.
Per Price's account 26 Spits were lost or probably lost in combat with Zeroes in these same combats, excluding the 2 lost to Army Type 1's on June 20.
Japan Center for Asian Historical Records(JACAR) National Archives Japan
Joe
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