Jules I can remember many years ago reading about a Coastal Command Sunderland operating over the Bay of Biscay being attached by 8 Ju88 long range fighters. In the ensuing melee the pilot of the Sunderland dropped to wave top height , and proceeded to engage each incoming Ju88 with the turrets and pom-pom guns in the beam positions.
If memory serves me, by the time the dog fight broke up, 4 Ju88s were in the bay, and another would crash on landing, while the Sunderland, though much battered, returned to base. No wonder the Luftwaffe called the Sunderland the 'Flying Porcupine'!
The Battle of the Atlantic, has to rank as one of the most protracted, and brutal of the second world war battles, but one that doesn't always appear to receive the recognition that it deserves.
Karl