The Mountain Howitzer was a light, smooth bore cannon designed to shoot a heavy projectile with a light powder charge, contained in a sub-caliber chamber at the bottom of the bore. Because of its light weight, it was much handier than other cannons of similar caliber.
Two howitzers held off an entire regiment during an action on the 2nd of June in 1865. The Mountain Howitzer used a special light weight carriage, which could be taken apart and packed, gun and all, on three mules. These cannons saw use through the Indian Wars on the Western frontier where the mountainous country precluded the use of heavier field cannon. The Mountain Howitzer also was a favorite in the Mexican War where it could be deployed from roof tops in street fighting.