3rd United States Infantry

== Regimental History and Service Record ==
* In Texas until March, 1861
** April 25, 1861 - Surrender at Saluria, Texas (3 Companies)
* Companies "C" and "E" moved to New York March, 1861, and Companies "B," "D," "G," "H" and "K" to New York March 19-April 25, 1861
* Companies "C" and "E" moved to Fort Pickens, Fla., arriving there April 16, 1861, and duty there until June, 1862
** Action on Santa Rosa Island, Fla., October 9, 1861
** Bombardment of Fort Pickens November 22-23
** Fort Barrancas January 1, 1862
** Fort Pickens May 9-12
** Rejoined Regiment in Army Potomac June, 1862
* Companies "A," "F" and "I" surrendered at Mattagorda Bay, Texas, April 26, 1861
** Companies "F" and "I" Joined Regiment at Washington February, 1862
* Companies "B," "D," "G," "H" and "K" moved from Fort Hamilton, N.Y. Harbor, to Washington, D. C., May 9, 1861, and duty there until March, 1862
** Attached to Department of Pennsylvania / 1st Division (Cadwallader) / 4th Brigade (Miles), Brigaded with:Listed in this unit on ACWR 270, but this part of the unit history does not appear on ACWR 1710.
** 9th Pennsylvania Infantry
** 13th Pennsylvania Infantry
** 16th Pennsylvania Infantry
** 2nd United States Regular Infantry
* Attached to Department of Northeastern Virginia / 2nd Division (Hunter) / 1st Brigade (Porter), Brigaded with:
** 8th New York State Militia Infantry
** 14th New York Infantry
** 84th New York Infantry
** 27th New York Infantry
** 2nd United States Infantry
** 8th United States Infantry
** 1st United States Cavalry
** 3rd United States Cavalry
** Porter's City Guard, Washington, D.C., to March, 1862
** Sykes' Regular Infantry, Reserve Brigade, Army Potomac, to May, 1862
** 1st Brigade, 2nd Division, 5th Army Corps, Army Potomac, to August, 1863. Dept. of the East, to October, 1864
** Defenses of Washington, D.C., 22nd Army Corps, to February, 1865
** Headquarters Army Potomac, to May, 1865
** Defenses of Washington, 22nd Corps, to October, 1865
SERVICE.--
* July 16-21, 1861 - The Manassas Campaign
** July 21, 1861 - Battle of Bull Run, Virginia
* Duty at Washington until March, 1862. 
* Moved to the Virginia Peninsula March, 1862. 
* March 17-September 2, 1862 - The Peninsula Campaign 
** April 5-May 4, 1862 - Siege of Yorktown, Virginia
** June 25-July 1, 1862 - The Seven Days Battles before Richmond, Virginia
*** June 26, 1862 - Engagement at Beaver Dam Creek, Virginia
*** June 27, 1862 - Engagement at Gaines's Mill, Virginia
*** June 30, 1862 - Engagement at Turkey Bridge, Virginia
*** July 1, 1862 - Engagement at Malvern Hill, Virginia
At Harrison's Landing until August 16. Moved to Fortress Monroe, thence to Centerville August 16-28. Pope's Campaign in Northern Virginia August 28-September 2. Battles of Groveton August 29; Bull Run August 30. 
* September 3-20, 1862 - The Maryland Campaign
** September 17, 1862 - Battle of Antietam, MarylandOriginally listed on unit homepage but not referenced in Dyer summary
** September 19, 1862 - Actions at Sharpsburg and Shepherdstown/Blackford's/Boteler's Fords, Maryland
** Shepherdstown Ford September 19-20.
* At Sharpsburg until October 29.
** Kearneysville and Shepherdstown October 16-17. 
* October 16-17, 1862 - Reconnoissance from Sharpsburg, Maryland to Smithfield, West VirginiaNot originally listed on unit homepage but referenced in Dyer summary
Moved to Falmouth, Va., October 29-November 19. Battle of Fredericksburg, Va., December 12-15. "Mud March" January 20-24, 1863. 
 
* May 18-July 4, 1863 - Siege of Vicksburg, MississippiNot originally referenced on unit homepage, likely wasn't here
* April 27-May 6, 1863 - The Chancellorsville Campaign
** May 1-5, 1863 - Battle of Chancellorsville, Virginia
* June 11-August 1, 1863 - The Gettysburg Campaign
** July 1-3, 1863 - Battle of Gettysburg, Pennsylvania
Pursuit of Lee July 5-24. At New York City during draft disturbances August 21-September 14. Bristoe Campaign October 9-22. Advance to line of the Rappahannock November 7-8. Mine Run Campaign November 26-December 2. Ordered to New York December, 1863, and duty at Forts Richmond, Hamilton and Columbus, N.Y. Harbor, until October, 1864. Ordered to Washington, D.C., and duty there until February, 1865. Ordered to City Point, Va., and duty at Headquarters, Army of the Potomac, to May, 1865. Fall of Petersburg April 2. Moved to Washington, D.C., May, and duty there until October, 1865. Grand Review May 23.
== Regimental Roster ==
== Regiment Statistical Information ==
* Regiment lost during service 2 Officers and 39 Enlisted men killed and mortally wounded and 48 Enlisted men by disease. Total 89.
== Legacy ==
* 3rd United States Infantry / Company B - Reenactors Home Page
== Notes ==
== Sources == 
* (Pages 270, 271, 758, 759, 779, 828, 880, 895, 897, 902, 903, 904, 905, 916, 1710-1711)
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