Army Regulations were the written law to which it was attempted to have everything conform as far as possible. But when these regulations were drafted, there was no expectation of such a war as finally came upon us, and to attempt to confine so large an army as then existed to them as a guide was as impossible and absurd as for the full-grown man to wear the suit of clothes he cast off at ten years.

“New times demand new measures and new men,”

and so in certain directions Army Regulations had to be ignored. For example, they provided only for the establishment of regimental and general hospitals. A regimental hospital is what its name indicates—the hospital of a particular regiment. But if such a hospital became full or received some patients whose ailments were not likely to submit readily to treatment, such cases were sent to a General Hospital, that is, one into which patients were taken regardless of the regiment to which they belonged. But in these early war times, in the absence of a system, any patient who was able could, at his pleasure, leave one general hospital and go to another for any reason which seemed sufficient to him, or he could desert the service entirely.

By general orders issued from the war department May 25, 1861, governors of States were directed to appoint a surgeon and assistant surgeon for each regiment. The men appointed were for the most part country physicians, many of them with little practice, who, on reaching the field, were, in some respects, as ignorant of their duties under the changed conditions as if they had not been educated to the practice of medicine; and the medical director of the army found his hands more than full in attempting to get them to carry out his wishes. So, to simplify his labors and also to increase the efficiency of his department, brigade hospitals were organized about the beginning of 1862, and by general orders from the war department brigade surgeons were appointed, with the rank of major, and assigned to the staffs of brigadier-generals. These brigade surgeons had supervision of the surgeons of their brigades, and exercised this duty under the instructions of the medical director.

The regimental hospitals in the field were sometimes tents, and sometimes dwellings or barns near camp. It was partly to relieve these that brigade hospitals were established. The latter were located near their brigade or division.

The hospital tent I have already described at some length. I may add here that those in use for hospital purposes before the war were 24 feet long by 14 feet 6 inches wide, and 11 feet 6 inches high, but, owing to their great bulk and weight, and the difficulty of pitching them in windy weather, the size was reduced, in 1860, to 14 feet by 14 feet 6 inches, and 11 feet high in the centre, with the walls 4 feet 6 inches, and a “fly” 21 feet 6 inches by 14 feet. Each of these was designed to accommodate eight patients comfortably. Army Regulations assigned three such tents to a regiment, together with one Sibley and one Wedge or A tent.

The Sibley tent I have likewise quite fully described. I will only add here that, not having a “fly,” it was very hot in warm weather. Then, on account of its centre pole and the absence of walls, it was quite contracted and inconvenient. For these reasons it was little used for hospital purposes, and not used at all after the early part of the war.

The hospital tents in the Army of the Potomac were heated, for the most part, by what was called, for some reason, the California Plan. This consisted of a pit, dug just outside of the hospital door, two and a half feet deep, from which a trench passed through the tent, terminating outside the other end in a chimney, built of barrels, or in such a manner as I have elsewhere described. This trench was covered throughout its entire extent with iron plates, which were issued by the quartermaster’s department for that purpose. The radiation of the heat from the plates kept the tent very comfortable.

The honor of organizing the first field hospital in tents is said to belong to Dr. B. J. D. Irwin, U. S. A., of the Army of the Ohio. It occurred at the battle of Shiloh. While establishing a hospital near the camp of Prentiss’ division of that army, which had been captured the day before, the abandoned tents still standing suggested themselves to him as a convenient receptacle for his wounded. He at once appropriated the camp for this purpose, and laid it out in systematic form. It was clearly shown by this and succeeding experiences during the war that the wounded treated under canvas did better and recovered more rapidly than those treated in permanent hospitals.