It served on provost duty in Maryland and Delaware from 1863 to early 1864, and fought in the action at Westminster known as Corbit's Charge during the Gettysburg Campaign.
Delaware politician George P. Fisher was commissioned by the War Department to raise a 1,200-man cavalry regiment, including Knight's battalion, on 9 September.
[2] Due to the small population of the state, the regiment could not be expanded to the projected strength, with only seven understrength companies out of a typical ten being raised.
The regiment was on provost duty in and near Baltimore for the next year, and elements of it fought in the action at Westminster (Corbit's Charge) on 28 June; this was its first combat.
[5] The regiment served on picket and outpost duty along the line of the Baltimore and Ohio Railroad, and guarded fords of the Potomac River between Georgetown and Point of Rocks until November, when it briefly returned to Delaware for the United States presidential election.
In mid-April its detachments helped in the search for the Booth conspirators, one of whom, George Atzerodt, was captured by a squad led by Sergeant Zachariah W. Gimmell on 20 April, and brought to the Relay House camp.