It might be they get frozen by the script through to the end, but I mean they should deploy them at least behind the line of infantry. Lemme see if I can do this with ascii...


..........VVV<-- where they should put the guns
.....====== <-- US inf |||| <-- this is the court house, which is right on the corner of a foresty ridge, so you can't flank it to the right. The AI puts its line infantry to the left (my left) most of the time, sometimes a little closer to me than the court house.

......====== <-- my inf
......///////// <-- my inf/cav/guns

But their guns stay way off in the corner where they start, so they can't do anything. If they used their dragoons to keep cav from running around their line, they could set up shop and blast away. And it'd be better than what they did last time I played - sit and get shot at by my artillery. I eventually advanced because I felt sorry for the thing.