18th Pennsylvania Infantry Regiment in the American Civil War

1861
April 24	The 18th Pennsylvania Infantry Regiment was organized at Philadelphia and mustered in at Washington Square, Philadelphia, Pa. under the command of Colonel William D. Lewis, Jr., Lieutenant Colonel Charles Wilhelm and Major Alexander Niebold. Company A – Captain John M. Gosline Company B – Captain Peter Fritz Company C Company D – Captain Edmond N. Baudin Company E – Captain John Miller Company F – Captain Jacob H. Beattes Company G – Captain John S. Dull Company H – Captain John Maxwell Company I – Captain Gustavus S. Kintzing Company K – Captain Theodore Hesser
May 14	Moved via Perryville to Baltimore, Md., with duty near Fort McHenry assigned to the Department of Annapolis.
May 22	At Federal Hill in Baltimore
June 12 -July 23	Companies B and K under Captain Peter Fritz at the National Arsenal at Pikesville removing stores to Fort McHenry
July 24	Companies B, C, D, E, G, H and K and part of I reenlisted for ten days at the request of General Banks.
July 29	Relieved by the 5th New York Infantry and moved to Philadelphia
August 6	The 18th Pennsylvania Infantry Regiment mustered out. Sergeant Major Charles H. T. Collis went on to become colonel of the 114th Pennsylvania Infantry, eventually became a brevet major general, and earned the Medal of Honor.