90th Pennsylvania Infantry

== Regimental History and Service Record ==
Organized at Philadelphia October 1, 1861. Moved to Baltimore, Md., March 31, 1862, thence to Washington, D.C., April 21 and to Aquia Creek Landing, Va., and duty there until May 9. Attached to 1st Brigade, 2nd Division, Dept. of the Rappahannock, to June, 1862. 2nd Brigade, 2nd Division, 3rd Corps, Army of Virginia, to September, 1862. 2nd Brigade, 2nd Division, 1st Army Corps, Army Potomac, to March, 1864. 2nd Brigade, 2nd Division, 5th Army Corps, to May, 1864. 1st Brigade, 2nd Division, 5th Army Corps, to June, 1864. 1st Brigade, 3rd Division, 5th Army Corps, to September, 1864. 2nd Brigade, 3rd Division, 5th Army Corps, to November, 1864.
SERVICE.--Duty near Fredericksburg, Va., until May 25. Expedition to Front Royal to intercept Jackson May 25-June 16. Duty at Manassas, Warrenton and Culpeper until August. Battle of Cedar Mountain August 9. Pope's Campaign in Northern Virginia August 16-September 2. Fords of the Rappahannock August 21-23. Thoroughfare Gap August 28. Battle of Bull Run August 30. Chantilly September 1. 
* September 3-20, 1862 - The Maryland Campaign
** September 14, 1862 - Battle of South Mountain, Maryland
** September 17, 1862 - Battle of Antietam, Maryland
Duty near Sharpsburg, Md., until October 30. Movement to Falmouth, Va., October 30-November 19. Battle of Fredericksburg December 12-15. Burnside's 2nd Campaign, "Mud March," January 20-24, 1863. At Falmouth and Belle Plains until April 27. 
* April 27-May 6, 1863 - The Chancellorsville Campaign
** Operations at Pollock's Mill Creek April 29-May 2. 
** Fitzhugh's Crossing April 29-30.
** 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. Duty on line of the Rappahannock until October. Bristoe Campaign October 9-22. Advance to line of the Rappahannock November 7-8. Mine Run Campaign November 26-December 2. Demonstration on the Rapidan February 6-7, 1864. Duty on Orange & Alexandria Railroad until May.
* May 4-June 12, 1864 - The Overland Campaign
** May 5-7, 1864 - Battle of the Wilderness, Virginia
** May 8-21, 1864 - Battles of Spotsylvania Court House, Virginia
*** May 8, 1864 - Combat at Laurel Hill, Virginia
*** May 12, 1864 - Assault on the Salient at Spotsylvania Court House, Virginia
** May 22-26, 1864 - Operations on Line of the North Anna River, Virginia
*** May 25, 1864 - Engagement at Jericho Ford, Virginia
** May 26-28, 1864 - Operations on Line of the Pamunkey River, Virginia
** May 28-31, 1864 - Operations on Line of the Totopotomoy River, Virginia
** June 1-12, 1864 - Battles of Cold Harbor, Virginia
*** June 1-3, 1864 - Battle of Bethesda Church, Virginia
White Oak Swamp June 13. Before Petersburg June 16-18. Siege of Petersburg June 16 to November 26, 1864. Mine Explosion, Petersburg, July 30. Weldon Railroad August 18-21. Reconnaissance to Dinwiddie C. H. September 15. 
* November 26, 1864 - Consolidated with (II) 11th Pennsylvania Infantry
== Regimental Roster ==
== Regiment Statistical Information ==
* Regiment lost during service 5 Officers and 98 Enlisted men killed and mortally wounded and 1 Officer and 126 Enlisted men by disease. Total 230.
== Legacy ==
== Notes ==
== Sources == 
* (Pages 760, 761, 827, 905, 916, 932, 933, 934, 936, 938, 939, 940, 941, 1603-1604)
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