In October 1862, the unit's colonel Arno Voss left for the recruiting serving, putting Davis in charge of the regiment until the next February. The unit saw action at the Battle of Harpers Ferry, escaping the surrounded fortification and taking a band of prisoners in the process. As part of Stoneman's 1863 Raid during the Battle of Chancellorsville, Davis was ordered to take a brigade to disrupt the Richmond, Fredericksburg &amp; Potomac and Virginia Central Railroads. He returned to Illinois with the regiment in November 1863 to reorganize as a veteran regiment.