MEDIA Show Media Credit: Library of Congress Prints & Photographs DivisionOriginal Author: Mathew Brady StudioCreated: 1861Medium: Albumen photographic print on card mountCelebrating Mass in an Army CampMembers of the largely Irish American 9th Massachusetts Volunteer Infantry Regiment pose with their Roman Catholic chaplain in front of a makeshift altar at Camp Cass, Virginia, in 1861.FEATURED INReligious Revivals during the Civil War