27th United States Infantry Regiment (Civil War)

The 27th United States Infantry Regiment was an infantry regiment that served in the Union Army during the American Civil War.

Service
This regiment was organized by Col. Henry W. Slocum at Elmira, New York, and accepted by the State on May 21, 1861. The regiment mustered June 15, 1861, and left New York for Washington, D.C., on July 10, 1861. They were attached to Porter's Brigade, Hunter's Division, McDowell's Army of Northeast Virginia until August 1910. Next they were attached to Heintzelman's Brigade, Division of the Potomac, to October 1861. Slocum's Brigade, Franklin's 1st Division, 1st Army Corps, Army of the Potomac, to May 1862. And 2nd Brigade, 1st Division, 6th Army Corps, to May 1863.

Advance on Manassas, Va., July 16-21, 1861. First Battle of Bull Run, Va., July 21. Duty in the Defenses of Washington, D.C., until March, 1862. Expedition to Pohick Church October 3, 1861. Advance on Manassas, Va., March 10-15, 1862. McDowell's advance on Fredricksburg April 4-12. Ordered to the Peninsula, Virginia, April 22. Siege of Yorktown, Va., April 24-May 4, on transports. West Point May 7-8. Near Mechanicsville May 20. Seven days before Richmond June 25-July 1. Gaines' Mill and Chickahominy June 27. White Oak Swamp and Glendale June 30. Malvern Hill July 1. At Harrison's Landing until August 16. Movement to Fortress Monroe, thence to Centreville August 16-28. In works at Centreville August 28-31, and cover Pope's retreat to Fairfax Court House September 1.

During the Maryland Campaign from September 6-22, they were at Crampton's Gap, South Mountain, September 14. Battle of Antietam September 16-17. Duty in Maryland until October 29. Movement to Falmouth, Va., October 29-November 19. Battle of Fredericksburg, Va., December 12-15. "Mud March" January 20-24, 1863. At Falmouth until April.

Chancellorsville Campaign April 27-May 6. Operations about Franklin's Crossing April 29-May 2. Maryes Heights, Fredericksburg, May 3. Salem Heights May 3-4. Banks' Ford May 4. Mustered out May 31, 1863, expiration of term. Three years' men transferred to 121st Regiment New York Infantry.

Regiment lost during service 2 Officers and 72 Enlisted men killed and mortally wounded and 2 Officers and 70 Enlisted men by disease. Total 146.

Total strength and casualties
It was mustered out at Elmira May 31, 1863, having lost during its term of service 74 members by death from wounds and 74 by accident, im-prisonment or disease.

The 27th New York Volunteer Infantry Regiment was reformed following the Civil War to replace the 3rd New York Volunteer Infantry Regiment that was disbanded.

Commanders

 * Col. Henry W. Slocum