The 103rd Pennsylvania Infantry Regiment lost 3 officers and 50 enlisted men killed or mortally wounded and 1 officer and 352 enlisted men to disease during the Civil War.

1861
September 7 Organized at Kittanning
1862
February 24 Moved to Harrisburg, then to Washington, D.C.
March Attached to 2nd Brigade, 3rd Division, 4th Army Corps, Army of the Potomac
March 10-15 Advance On Manassas, Va.
March 28 Ordered to the Peninsula
April 5-May 4 Siege of Yorktown
April 11 Skirmish at Yorktown
May 5 Battle of Williamsburg
May 30 Skirmish at Fair-Oaks
May 31-June 1 Battle of Fair Oaks, Seven Pines
June Attached to 2nd Brigade, 2nd Division, 4th Army Corps
June 25-July 1 Seven days before Richmond
June 30 Brackett’s
July 1 Malvern Hill
July At Harrison’s Landing
August 16-23 Moved to Fortress Monroe
September 18 To Suffolk. Attached to Wessell’s Brigade, Division at Suffolk, Va., 7th Corps, Dept. of Virginia
October 9 Blackwater
October 25 Blackwater, near Zuni
October 29 Blackwater
December 1-3 Expedition from Suffolk
December 1 Beaver. Dam Station
December 2 Near Franklin on the Blackwater
December 4 Ordered to New Berne, N. C. and attached to 1st Brigade, 1st Division, Dept. of North Carolina
December 10-21 Foster’s Expedition from New Berne to Goldsboro
December 13-14 Southwest Creek
December 14 Kinston
December 16 Whitehall
December 17 Goldsboro
December-May Duty at New Berne
1863
January Attached to 1st Brigade, 4th Division, 18th Army Corps, Dept. of North Carolina
February 7-14 Expedition from New Berne to Mattamuskeet Lake
April 7-10 Expedition for relief of Little Washington
May Moved to Plymouth, N. C. Attached to District of Albemarle, Dept. of North Carolina
July 5-7 Expedition from Plymouth to Gardner’s Bridge and Williamston
July 26-29 Expedition to Foster’s Mills
August Attached to Sub-District, Albemarle, District of North Carolina, Dept. of Virginia and North Carolina
December 10 Hereford
1864
January Attached to District Of Albemarle, Dept. of North Carolina
January 20 Harrellsville (Detachment)
January 30 Windsor
April 17-20 Siege of Plymouth
April 20 Most of regiment captured.
May Survivors on duty in District Of the Albemarle as garrison at Roanoke Island
1865
June 25 Mustered out