As you can see several of the cannoneers ride on the limber, others on the team pulling the cannon. The cannon itself is attached to the back of the limber. The cannon is pulled on the field of battle and unlimbered.
The gun ready to fire.
The cannon had to be extricated quickly so it was dragged away by attaching the prolonge rope to the limber.
The gun was set up at the new position and commenced firing.