Pretty sure you can nail them with HE area fire from a tank, havent done it for a while so I cant remember whether:
a) It actually worked
or
It was just a crazy idea that failed so miserably I chose to forget the outcome
I know its cruel to the pixeltruppen, but if they will waste my sqauds time over more than 5 turns, they are asken for a blasten >:-)
In the CW module you dont need to worry about surrendering, because so far the axis forces you come across appear to be mainly SS and Hitler Youth, which just do not give up at all, so no feeling guilty about a bit of HE tidy up!