4 ADU was at that date based at Sorman in Libya, some 20+ miles W of Tripoli and less than 300nm S of Sicily.
After prior wide-spread heavy air attack around the theatre, the invasion of Sicily began 10 July 1943, ending late Aug when the Axis force withdrew.
There are numerous accounts of HUSKY.
Conceivably (others may know better), Tripoli etc may have come under air attack from Sicily, and/or 4 ADU may have been assisting with aircraft movements for Sicily making interceptions a possibility.
From Sturtivant RAF Flying Training and Support Units Since 1912 (AB 2007):
No.4 AIRCRAFT DELIVERY UNIT (MIDDLE EAST)
Formed 25.5.43 in No.216 Group at AZIZIA; 19.7.43 SORMAN; 5.11.43 TRIPOLI; 29.11.43 BONE; 14.11.43 BARI; by 21.1.44 CATANIA (dett Bari) (dett Sinello 15.7.44 - 9.9.44) ('B' dett Loreto 27.8.44 - 23.9.44); 21.9.44 JESI ('A' Dett Capodochino, 'C Dett Catania);
Redesignated No.4 Ferry Unit 23.9.44.
Aircraft: Anson I (LS995); Argus II (HB588); Expediter II (HB202)"
The term Flying battle was common enough at the time in referring to combat in the air.
As to the Fairey Battle someone else may know better, but I don't recall the aircraft being used in the Middle East though my interest is strictly in the period mid-1938 to Jan 1942.
Certainly Sturtivant's summaries of all the numerous Middle East OTUs record no mention of the Fairey Battle on their rosters, not even as support aircraft.
Besides, July 1943 would be very late for the poor old Battle.
I'd have thought, again open to correction, that mention of an aircraft by type on a service record was unlikely in this context.
On the face of it the Operations Record Book for 4 Aircraft Delivery Unit might help, given the hospitalisation.
TNA access at present is quite restricted but at some point it may be worth arranging to get a copy (not digitised so not on line).
Though the level of detail in such units is apt to be sparse, in this case Appendices are incl and may also prove fruitful. See
Good luck with the project...
Sources
Sturtivant as noted
Jefford RAF Squadrons (Airlife 2001)
Richards and Saunders RAF 1939-1945 Vol II The fight Avails HMSO 1954
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