Organized at Harrisburg June 24, 1863, for the protection of Pennsylvania against Lee's invasion. Duty in the Dept. of the Susquehanna. Destruction of railroad bridge at Wrightsville June 28. Moved to Carlisle, Pa., thence over South Mountain to Boonsboro, Md. Skirmish near Hagerstown July 11. Mustered out July 28, 1863.