Muster in date: July 28, 1861
Muster out day: July 17, 1865
They served for four years.
Other battles they served in:
Major Battles they were involved in:
The Battle of Antietam:
The regiment lost 1 killed, 36 wounded and 1 missing . There were three battles fought that day: "Cornfield", "Bloody Lane", and "Burnside's Bridge"
The Battle of Fredericksburg:
The regiment was in reserve and suffered no casualties in this battle.
The Battle of Spotsylvania Court House:
Grant’s attack on May 12 was initially a complete success, breaking through the Confederate lines before Lee rushed in troops to plug the gap. The battle raged into the night, the intense firepower of both sides flattening the landscape as soldiers engaged in hand-to-hand fighting at a position that became infamous as "Bloody Angle."
The Battle of the Crater:
There was a mine that the union had exploded to get rid of the front line of soldiers. There were 278 confederate soldiers that were killed in the explosion. After this attack the Union sent other soldiers in which the 45th PA regiment was one of the troops sent in to drive the remaining Confederates back. This worked to drive them back with hand-to-hand combat. Union casualties were 3,798 (504 killed, 1,881 wounded, 1,413 missing or captured), Confederate 1,491 (361 killed, 727 wounded, 403 missing or captured).