Part of the II Corps it served in the Eastern Theater of the American Civil War.

With this drastic shortage of men in the army, President Abraham Lincoln called on the states to raise a force of 75,000 volunteers for three months to put down the insurrection in the South.

The regiment comprised 37 officers and 742 enlisted men under the command of Colonel Henry H.

[1][2] The original Field & Staff were:[3] Colonel: Henry H. Lockwood Lieutenant Colonel: John W. Andrews Major: Robert Lamott Surgeon: R. W. Johnson Assistant-Surgeon: James Knight Adjutant: Lieutenant W. P. Seville Quartermaster: H. Alderdice The original Company Commanders were:[4] Co. A (Delaware Blues): Cpt.

This time the regiment had 37 officers and 846 enlisted men under the command of Colonel John W. Andrews.

Hopkinson Major: Thomas A. Smyth Surgeon: D. W. Maull Chaplain: Thomas G. Murphey Assistant-Surgeon: S. D. Marshall Adjutant: First Lieutenant W. P. Saville Quartermaster: First Lieutenant T. Y. England Sergeant-Major: James Lewis Quartermaster's Sergeant: Frank Wilson Commissary Sergeant: Charles S. Sehocffer Hospital Steward: Archibald D. O'Mera Drum-Major: Patrick Dooley The Company Commanders were:[6] Co. A: Cpt.

Thomas Crassley On July 1, 1864, the 3 years enlistment would have ended and the regiment would be mustered out.

Instead in July 1863 the men, still having nine months of their enlistment left, got the chance to reenlist for another 3 years from that date.

The 1st Delaware Infantry claimed to be first regiment in the Union to receive the coveted veteran status.

[10] At the Battle of Gettysburg in 1863 the regiment suffered 10 killed, 54 wounded, and 13 missing, being 31% from a total strength of 251.