Starbuck leads the Legion at the Battle of Chantilly, driving the last of John Pope's men out of Confederate territory, but Faulconer has obtained a position with the War Department and arranges to have Lieutenant Colonel Maitland placed in charge of the Legion while Starbuck is given command of a punishment battalion, the Yellowlegs. Starbuck manages to expose his superior, Colonel Holborow, as keeping the battalion away from the lines so he can sell their supplies on the black market and has the Yellowlegs transferred to Swynyard's brigade for the Maryland Campaign. The Legion stumble across Blythe, who fled the field at Manassass, and claims to be a Confederate officer, Captain Billy Tumlin, who was taken prisoner: He is made Starbuck's second-in-command. Meanwhile, Adam has been assigned as a courier by intelligence officer Colonel Thorne and collects a copy of Lee's battle plan which was left for him by Major Delaney. Adam is ambushed and killed by Southern horsemen but hides the order, which is later found by Northern troops. Starbuck leads the Yellowlegs to clear the ridge at the Battle of Harpers Ferry but the nervous Maitland keeps the Legion back. At the Battle of Sharpsburg, Swynward's brigade is decimated by Hooker's repeated attacks but manages to stand their ground, with Maitland drinking heavily to make it through the battle. Blythe flees back to Northern lines after manipulating Captain Dennison and Sergeant Case into trying to kill Starbuck; the attempt fails and Starbuck turns a cannon on them in retaliation. As the Confederates prepare to withdraw, Maitland is sent back to a staff position in Richmond, Starbuck is given command of the surviving members of both the Legion and the Yellowlegs, and Swynyard is promoted to brigadier general.