Why do caissons go rolling on?

The phrase "caissons go rolling along" refers to the traditional military song associated with the U.S. Army's field artillery. "Caissons" are large, wheeled vehicles used to transport artillery ammunition and supplies, and the song celebrates the spirit and resilience of the soldiers who serve. The imagery of caissons rolling along evokes a sense of movement and camaraderie among troops as they march into battle or carry out their duties. The phrase symbolizes both the literal journey of the artillery and the metaphorical journey of the soldiers’ dedication and service.