page_title: Limbers and caissons
section_title: Nineteenth century
hierarchical_section_title: Limbers and caissons / Nineteenth century
caption_attribution_description: Line engraving of a field gun on a limber used in the American Civil War, top view
context_page_description: A limber is a two-wheeled cart designed to support the trail of an artillery piece, or the stock of a field carriage such as a caisson or traveling forge, allowing it to be towed. The trail is the hinder end of the stock of a gun-carriage, which rests or slides on the ground when the carriage is unlimbered.
  A caisson is a two-wheeled cart designed to carry artillery ammunition; the British term is "ammunition waggon". Caissons are also used to bear the casket of the deceased in some state and military funerals in certain Western cultures, including the United States.
context_section_description: The British developed a new system of carriages, which was adopted by the French, then copied from the French by the United States.
  During the American Civil War, U.S. Army equipment was identical to Confederate Army equipment, essentially identical to French equipment, and similar to that of other nations.  The field artillery limber assumed its archetypal form – two wheels, an ammunition  chest, a pintle hook at the rear, and a central pole with horses harnessed on either side.  The artillery piece had an iron ring (lunette) at the end of the trail.  To move the piece, the lunette was dropped over the pintle hook (which resembles a modern trailer hitch).  The connection was secured by inserting a pintle hook key into the pintle.
  The quantity of ammunition in the chest, which could be detached from the limber, depended on the size of the piece.  An ammunition chest for the M1857 light 12-pounder gun ("Napoleon") carried 28 rounds.  The cover of the ammunition chest was made of  sheet copper  to prevent stray embers from setting the chest on fire.
  Six horses were the preferred team for a field piece, with four being considered the minimum team.  Horses were harnessed in pairs on either side of the limber pole.  A driver rode on each left-hand ("near") horse and held reins for both the horse he rode and the horse to his right (the "off horse").
  In addition to hauling the artillery piece, the limber also hauled the caisson, a two-wheeled cart that carried two extra ammunition chests, a spare wheel and extra limber pole slung beneath. There was one caisson for each artillery piece in a battery. The cannoneers could ride the ammunition chests on the limbers and the caisson when speed was required, but to do so for any length of time was too tiring for the horses, so cannoneers generally walked.  The exception to this rule would be in horse-artillery batteries, where the cannoneers rode saddle horses.
  When the artillery piece was in action, the piece's limber would have been six yards behind the piece, depending on the terrain, with the caisson and its limber farther to the rear of the firing line, preferably behind some natural cover such as a ridge.  While firing the piece, if possible, the crew kept the two ammunition chests on the caisson full, preferably supplying the gun from the third ammunition chest on the caisson's limber. When the ammunition from the ammunition chest on the piece's limber was exhausted, the piece's limber and the caisson's limber exchanged places.  The empty ammunition chest was removed, and then the middle chest on the caisson was moved forward onto the limber.  A fully loaded ammunition chest for a "Napoleon" 12-pounder weighed 650 pounds, so the chest was dragged and pushed, rather than lifted, into place.  With a full ammunition chest in place, the limber was ready to move forward and supply the piece.
  Although the limber's primary purpose was to haul the artillery piece and the caisson, it also hauled the battery wagon and a traveling forge.  The battery wagon carried spare parts, paint, etc., while the traveling forge was for use by a blacksmith in keeping the battery's hardware in repair.  The ammunition chest on the limber hauling the battery wagon contained carpenters' and saddlemakers'  tools, and the ammunition chest on the limber hauling the traveling forge contained blacksmiths' tools.
  Siege artillery limbers, unlike field artillery limbers, did not have an ammunition chest.  Siege artillery limbers resembled their predecessors:  they were two-wheeled carts with a pintle, now somewhat behind the axle.  When the piece was to be hauled, the trail was raised above the limber, then lowered, with the pintle fitting into a hole in the trail.  Unlike the situation with its predecessors, horses were harnessed to the 19th-century limber in pairs, with six to ten horses needed to haul a siege gun or howitzer.
caption: Limber (left) and field gun, ca. 1864 (top view)
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