The quartermaster's department was charged with all matters connected with transportation; with the supplying of clothing, canvas, and equipage of all sorts. Both the commissary and the ordnance departments were dependent upon the quartermaster for the transportation of their respective stores. The wagon trains required by the Army of the Potomac for all this service were prodigious. They were made up of four and six mule teams with heavy "prairie schooners" or canvas-covered wagons. I have seen two thousand of them halted for the night in a single park, and such trains on the march six to ten miles long were not unusual. It will readily be seen that to have them within easy reach, and prevent their falling into the hands of an alert enemy, was a tremendous problem in all movements of the army. The army mule has been much caricatured, satirized, and abused, but the soldier had no more faithful or indispensable servant than this same patient, plodding, hard-pulling, long-eared fellow of the roomy voice and nimble heels. The "boys" told a story which may illustrate the mule's education. A "tenderfoot" driver had gotten his team stalled in a mud hole, and by no amount of persuasion could he get them to budge an inch. Helpers at the wheels and new hands on the lines were all to no purpose. A typical army bummer had been eying the scene with contemptuous silence. Finally he cut loose: "Say! You 'uns dunno the mule language. Ye dunno the dilec. Let a perfesser in there." He was promptly given the job. He doffed cap and blouse, marched up to those mules as if he weighed a ton and commanded the army. Clearing away the crowd, he seized the leader's line, and distending his lungs, he shot out in a voice that could have been heard a mile a series of whoops, oaths, adjectives, and billingsgate that would have silenced the proverbial London fish vender. The mules recognized the "dilec" at once, pricked up their ears and took the load out in a jiffy. "Ye see, gents, them ar mules is used to workin' with a perfesser." The commissary department supplied the rations, and the ordnance department the arms and ammunition, etc. Still another branch of the service was the provost-marshal's department. This was the police force of the army. It had the care and custody of all prisoners, whether those arrested for crime, or prisoners of war--those captured from the enemy. In the case of prisoners sentenced to death by court-martial, the provost guard were their executioners. CHAPTER III ON THE MARCH