Obscure theater: Slovakia. I already had in mind a campaign for SPWW2 following Slovakian army in the Poland, Russia and finally in desperate fights of the Slovakain uprising. The problem is that the SPWW2 OOB was not too accurate and work on my own OOB was stopped during waiting for SPWW2.
Another one would be the combat ops of Czechoslovakian units in the USSR (first Bn, then Bde, then Army Corps). OK, enough about Czechoslovakia now
Anyway, our Armoured Brigade in England fought mostly in an non-armor way during the siege of German garrison of Dunkerque, tankers got to accustom to small boats.
EDIT: Btw have to agree, I can't get how are you all able to read all the articles posted, I thought of myself I am a fast reader, but
