A chest to hold ammunition.

A four-wheeled carriage for conveying ammunition, consisting of two parts, a body and a limber. In light field batteries there is one caisson to each piece, having two ammunition boxes on the body, and one on the limber.

A chest filled with explosive materials, to be laid in the way of an enemy and exploded on his approach.

A four wheeled cart carrying two ammunition chests and a spare wheel. The caisson could be attached to the limber for transport.

different kinds of chamber, box or chest that are used in various kinds of construction Nearby drilling caused a dust problem in the caisson

An ammunition wagon for artillery.

a two-wheeled military vehicle carrying artillery ammunition

a wagon pulled by horses

a wagon used for hauling ammunition

A two-wheeled cart, bearing two ammunition chests, drawn by a limber and its team.

In a military context, caisson is a carrier of artillery ammunition. Caisson is also the French term. In British usage, it was usually called a limber.