The "U.S. Field Artillery March" is a patriotic military march of the United States Army written in 1917 by John Philip Sousa after an earlier work by Edmund L. Gruber. The refrain is the "Caissons Go Rolling Along". This song inspired the official song of the U.S. Army, "The Army Goes Rolling Along".

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.