The Armory is another fine specimen of Gold Rush architecture; its massive iron doors are
among the largest to be found in the Gold Country. Built in 1864 by public subscription, at a
cost of over $8,000, the brick building served as the armory and training center for the
Copperopolis Union Guard Third Brigade during the Civil War. Enlistment records show that
eighteen Copperopolians joined the Union forces during the war. The building was sold a few years
after its completion for $800 in gold. In 1875, the I.O.O.F. acquired the building. Recently
restored, the structure currently serves as a community hall.