sentences:  When the Army of the Potomac withdrew from the Peninsula, the Regiment proceeded to the vicinity of Yorktown, where it remained a week destroying earthworks, and August 29th it embarked for Alexandria, where it landed September 1st.It shared the fortunes of Pope's Bull Run campaign, was in position at Elk Mountain on the 17th of September, during the Battle of Antietam, and subsequently, after performing a variety of fatiguing duties, marched with Franklin's corps to a position in front of Fredericksburg.In the assault upon that city, December 14th, it acted with spirit and efficiency.