Looking for an author

So I am not sure where to put this. It IS plot related, but maybe it deserves a more general forum. Anyway, here it is.

When I was in school back in the 90s there was a series of fiction books set in WWII. If I remember correctly, the stories were set from both sides of the fence (Axis / Allies). The author was pretty prolific, but for the life of me I cannot find who he was. I get the feeling that the books were not initially released in the 90s, I think they were reprints. Perhaps the author had even been writing since the 70s?

I falsely remembered that it was Clive Cussler. It was not. I looked him up recently and it was certainly not him.

Anyone have any ideas?

WWII fiction, prolific author, possible written in the 70s/80s.

I know, that is pretty vague.

Could be. I had stumbled onto his name too and I saw a cover for one of his books and I thought maybe... Just maybe...

Thanks. I will give him another look.

Actually digging into Hassel further led me to Leo Kessler. I think it was Kessler.

On my travels, this is pretty neat. A virtual literary map:

http://www.literature-map.com/leo+kessler.html