CSA artillery

[Mr. Yuck]

I don't think there are limits for detailed combats. I've only been playing them for a month though.
 
You get all your forces that are in the province already and you can reinforce from adjacent provinces any time. The reinforcement show up at the rate of two units per turn and whether they are fatigued or fresh depends on whether you have a rail link to move them.
 
Time consuming? Yes but detailed combat is definitely the way to go when facing a superior force.

[Gil R.]

There's no limit. In "Crown of Glory" there used to be a limit so that battles could not be bigger than the biggest Napoleonic battles, but too many players howled about it, so the limit was dropped from the engine.