I put four of the large brigades with 5 or more regiments, each under the command of a one star into McDowell's army. I then add three batteries of 12 or 10 lbers loose for support along with the balloon. This still gives a 10% penalty.
I don't recommend using this to attack the CSA. Any newspaper editor from the game event who would find this bad gets a raw steak and a plate full of uncooked vegetables. If he can eat this meal as is, then maybe I'll listen to his advice on attacking with men who aren't ready.
I'm the 51st shade of gray. Eat, pray, Charge!