Veteran accounts, anecdotes by others, the logic that said unit was employed so thus it was, questionable history (but would depend on source usage and need proper analysis).

There are plenty of iffy vet accounts (and iffy interview techniques that lead) about.

Some archives should almost apply caveats to certain interviews, to forewarn the generalist or unwary.

But then how far do you go etc?

Some of the worst factoids stem from period jokes, reported verbatim as if real events.

The construction of WW2 mythology is one of my real interests, as you can occasionally see it in real time.

In recent years, 'Dunkirk Spirit' has proved particularly awful and very confused etc. Ended up being politically charged.