An update. I have made some more tests and I see that I can mix regular with Militia and Volunteers, regiments with brigades, different elements under a one star leader as a single brigade commander, and even units from different states. All of this apparently without a logic. I am even more confused.

Hi I am new of the game. So I could ask sometinng that you have already dealt with. 1) Some of the units appears as a single regiment instead as a brigade: Cavalry, Militia, Sharpshooters, Zouaves, US Infantry ecc. I have noticed that some of this unit can be merged to form a brigade size unit. I ha...