Left Pennsylvania for Washington, D.C., October 4, 1861. Duty at Arlington Heights, Va., defenses of Washington, D.C., until March 1862. Advance on Manassas, Va., March 10-15. Moved to the Virginia Peninsula April. Siege of Yorktown April 11-May 4. Baltimore Cross Roads, near New Kent Court House, May 13. Operations about Bottom's Bridge May 20-23. Reconnaissance toward Richmond and to Turkey Island Creek Bridge May 23. Savage Station May 24. Reconnaissance to Seven Pines May 24-27. Chickahominy May 24. Garnett's Farm and White Oak May 27. Battle of Fair Oaks (Seven Pines) May 31-June 1. Reconnaissance to White Oak Swamp June 22-23. Seven days before Richmond June 25-July 1. Bottom's Bridge June 28-29. Savage Station June 29. Malvern Hill July 1. At Harrison's Landing until August 16. (Company A at the Headquarters of Gen. Porter; Company B at the Headquarters of Gen. McClellan; Company D at the Headquarters of Gen. P. St. G. Cooke.) Turkey Island Bridge July 20. Reconnaissance to Malvern Hill July 23. Retreat from the Peninsula and movement to Alexandria. Maryland Campaign September. Falls Church September 3-4. Sugar Loaf Mountain September 10-11. Frederick September 12. Middletown September 13. Battle of Antietam September 16-17. Boteller's Ford, Sharpsburg, Md., September 19. Shepherdstown Ford September 19. Amissville September 30. Reconnaissance from Sharpsburg to Shepherdstown and Martinsburg, W. Va., October 1 (3 companies). Philomont November 1-2. Castleman's Ferry, Upperville, Union, and Bloomfield November 2-3. Aldie and Ashby's Gap November 3. Markham Station November 4. Barbee's Cross Roads November 5. Waterloo Bridge November 7. Hazel River November 8. Newby's Cross Roads, near Amissville, November 10. Philomont November 19. Leed's Ferry and King George Court House December 2. Battle of Fredericksburg December 12-15.