This regiment was organized April 26th, 1861, for three month's service. After a short period of drill it was, on the 27th of May, ordered foward to guard the Philadelphia, Wilmington, and Baltimore Railroads, some bridges on which had been destroyed. Company E, Captain Johnson, was stationed at Charlestown. On the 18th of June the regiment went via Baltimore and Harrisburg to Chambersburg, thence to Hagerstown, MD. On the 20th of June, it was placed in the bridgade commanded by Colonel (afterward General) Abercrombie, and on the 2nd of July crossed the Potomac at Williamsport under that commander and was actively engaged in the battle at Falling Water, in which the forces of Jackson were put to flight. In this action three Company E (James Morgan, Daniel R Stiles, and Nelson Headen) were wounded. After this fight the company went with the brigade to Martinsburg, thence to Bunker Hill and on the 17th of July to Charlestown. Here, as the expiration of their term of enlistment approached, General Patterson had the 11th paraded and requested the men to remain some days beyond this term. He asked them to signify their willingness to do by bringing their arms to a shoulder at the word. When the order was given every musket was shouldered. By arrangements the regiment was re-mustered for three years after it's muster-out and allowed to retain its number.