The 187th Pennsylvania Infantry Regiment lost 66 enlisted men killed or mortally wounded and 1 officer and 69 enlisted men to disease during the Civil War.

1864
March 3 to May 4 Organized at Philadelphia from 1st Battalion Militia Infantry (6 Mos.) under Lt. Colonel Joseph F. Ramsey and Major George W. Merrick
May 18 Moved to Washington, D.C.
May 26 Moved to join Army of the Potomac
June 6 Reported at Cold Harbor, Va.
June 6-12 Cold Harbor
June 16-18 Before Petersburg
June 16 Siege of Petersburg. Attached to 1st Brigade, 1st Division, 5th Army Corps
June 18 Major Merrick badly wounded.
June 21-23 Jerusalem Plank Road, Weldon Railroad
June 24 Captain David Z. Seipe of Company B promoted to major
July 30 Mine Explosion, Petersburg (Reserve)
August 18-21 Weldon Railroad
September 22 Relieved and ordered to Philadelphia.
September 26 Major Merrick discharged for wounds, having lost his leg from the wound at Petersburg
September 29 Lt. Colonel Ramsey discharged
October – August Garrison and escort duty at Camp Cadwalader, Philadelphia, Pa, and provost duty at other points in Pennsylvania
1865
January 31 Captain John E. Parsons was promoted to lieutenant colonel
May 12 Lt. Colonel Parsons was promoted to colonel
May Provided Guard of Honor over remains of President Lincoln in Independence Hall, Philadelphia, and escort to funeral cortege
June 19 Captain Joesph A. Ege of Company D was promoted to lieutenant colonel
June 24 Captain David Seipe of Company B was promoted to major
August 3 Mustered out