Unit cannot move from terrain

[Volcano Man]

If it is motorized or mechanized infantry then you could tell them to go on foot, but if it is a vehicle or gun unit of either type then you are out of luck as SGT Rice said.

I have done that myself and there is a famous incident of someone here at the Blitz getting their entire King Tiger battalion in Bulge 44 stuck in a marsh. :o You just have to be very careful with the weather forecast. I think it adds a very interesting element to the game.