The 18th New York Infantry Regiment ( "New York State Rifles") was an infantry regiment in the Union Army during the American Civil War.
The 18th New York Infantry was organized May 13, 1861, at Albany, New York and mustered in on May 17, 1861, for two years' service under the command of Colonel William A. Jackson.
The regiment was attached to Davies' Brigade, Miles' Division, McDowell's Army of Northeast Virginia, June to August 1861. Franklin's Brigade, Division of the Potomac, to October 1861. Newton's Brigade, Franklin's Division, Army of the Potomac, to March 1862. 3rd Brigade, 1st Division, I Corps, Army of the Potomac, to May 1862. 3rd Brigade, 1st Division, VI Corps, to May 1863.
The 18th New York Infantry mustered out of the service on May 28, 1863. Men who enlisted for three years' service were transferred to the 121st New York Volunteer Infantry on May 11, 1863.
Left New York for Washington, D.C., June 19. Reconnaissance on Fairfax Road, July 14, 1861. Advance on Manassas, Virginia, July 16âÂÂ21. Fairfax Court House, July 17. First Battle of Bull Run, July 21. Duty in the defenses of Washington, D.C., until March 1862. Skirmish at Springfield Station, October 3, 1861. Advance on Manassas, Virginia, March 10âÂÂ15, 1862. McDowell's advance on Fredericksburg, Virginia, April 4âÂÂ12. Ordered to the Virginia Peninsula, April 22. Siege of Yorktown, April 24 â May 4 (on transports). West Point, May 7âÂÂ8. Seven Days Battles before Richmond, June 25 â July 1. Gaines's Mill, June 27. White Oak Swamp and Glendale, June 30. Malvern Hill, July 1. At Harrison's Landing until August 16. Movement to Fort Monroe, then to Centreville, August 16âÂÂ28. In works at Centreville, August 29âÂÂ31. Cover Pope's retreat to Fairfax Court House, September 1. Maryland Campaign, September 6âÂÂ22. Crampton's Pass, South Mountain, September 14. Battle of Antietam, September 16âÂÂ17. Duty in Maryland until October 30. Movement to Falmouth, Virginia, October 30 â November 19. Battle of Fredericksburg, December 12âÂÂ15. "Mud March", January 20âÂÂ24, 1863. At Falmouth until April. Chancellorsville Campaign, April 27 â May 6. Operations at Franklin's Crossing, April 29 â May 2. Maryes Heights, Fredericksburg, May 3. Salem Heights, May 3âÂÂ4. Banks' Ford, May 4. Regiment moved to New York May 16.
The regiment lost a total of 71 men during service; four officers and 34 enlisted men killed or mortally wounded, one officer and 32 enlisted men died of disease.