Thank you for the reply "Tarheel" and Xenu...! Yes, you make a good point about streams and Gettysburg, but the simulation map has a stream through it with a bridge at one point. My troops appear to "walk on water" (which we all know the Rebs were able to do! :-) . I was just wondering if there could be an indication that the stream slows them down, or where too deep may not be crossed. (it would be nice if the troop icons appeared to go waist deep into the stream to reveal the nature of the obstacle). It's related to the simulation error of troops walking through buildings, instead of around the obstacle.