The men learn that, in response to the Emancipation Proclamation, the Confederacy has issued an order that all black soldiers will be returned to slavery. Black soldiers found in a Union uniform will be executed as well as their white officers. They are offered but turn down a chance to take an honorable discharge. They undergo rigorous training from Sergeant-Major Mulcahy, who is particularly hard on Searles. Despite Mulcahy's treatment of his friend, Shaw reluctantly realizes the tough discipline is needed to prepare them for the coming challenges the regiment must face.