Flying Pig's Old School Tactical game series. If you're looking for a fun and "not brain melting" complex tactical WW2 game, I highly recommend Old School Tactical.
I've been running some company level actions to test the rules and find some logic flaws. The first game proved that KV-1's shred tiny Panzer III's if they can not be outflanked. It also proved Germans trying to cross open ground without smoke or artillery support do not have a very good time of it.