Swamps and Streams

[hveldenz]

What is the probability of a tank becoming immobilized in a swamp? What is it in a stream? Are there any unit parameters that change that probability, such as "amphib" capable? Size?

I am playing one of the 1989 Nato/Warsaw pact scenarios (The US-East German meeting engagement). It seems 30% plus of my SP-70s and T-55AMD2s are getting immobilized in swamp and streams trying to outflank the US (as opposed to rushing all the units at the bridge by town.) This is even moving one hex per turn.

What is the % chance of immobilizing in those terrains so I can plan on how much to expect to eventually get across the terrain>

Thanks