Adishee, first off; amazing mod, had a ton of fun so far sending them yankee's back to Washington.
I saw in the change log (1.3.1) that US units are unable to add more men after forming a regiment (except in multiday battles.) however, as I'm playing with CSA this also seem to affect their units as well, including the ability to only reinforce during multiday battles. This doesn't seem to effect artillery units, as I can add more cannon and men to them just fine, just not the infantry units. Am I missing something here, or is this a bug?