The 129th Pennsylvania Volunteer Infantry Regiment lost 3 officers and 37 enlisted men killed and mortally wounded and 1 officer and 42 enlisted men to disease during the Civi War.

1862
August Organized at Harrisburg for nine months service under Colonel Jacob G. Frick (formerly lieutenant colonel of the 96th Pennsylvania Infantry), Lieutenant Colonel William H. Armstrong and Major Joseph Anthony. Companies, A, B, E, G, & H were recruited in Schuylkill county, Companies C, F, & K in Northampton, and Company, I, was recruited in Montgomery.
August 16 Moved to Washington, D.C. and duty there
August 18 Went into camp at Alexandria.
September 12 Left Washington attached to 1st Brigade. 3rd Division, 5th Army Corps, Army of the Potomac.
September 14 Reached the Monocacy River outside Frederick.
September 17 Resumed march west over South Mountain to the sound of heavy artillery fire
September 18 Arrived on the Antietam battlefield
September-October Duty at Sharpsburg, Maryland. Engaged in drill and “unimportant duty.”
October 16-17 Reconnaissance from Sharpsburg to Smithfield, W. Va.
October 30-
November 19
Movement to Falmouth, Va.
October 30 Crossed the Potomac into the Valley of Virginia.
December 12-15
Battle of Fredericksburg
1863
January 20-24 Burnside’s 2nd Campaign, “Mud March”
February – April At Falmouth
April 27-May 6 Chancellorsville Campaign
May 3
Battle of Chancellorsville

The regiment was closely engaged in line of battle in the wood in front of the Union batteries for nearly two hours. The right flank of the division was turned when its ammunition was exhausted. The division retired to unmask the Union batteries to the flanking Confederates. The 129th was the rearguard in the withdrawal, and in hand to hand combat the colors were seized twice but regained, and brought safely off.

May 12 The term of the regiment expired and it returned to Harrisburg.
May 18 Mustered out