In the Middle Ages there was no medical organization with armies, nor were there even any surgeons. The sick and wounded were left to shift for themselves, and were tended, if at all, by private persons out of charity, or in monasteries, for the monks alone possessed any knowledge of surgery and medicine in those days. Rudimentary provision for surgery in armies is found in the organization of the German mercenaries of the sixteenth century, where a surgeon was appointed by each Captain for his Troop of Reiters or Company of Landsknechts. Later, a Surgeon was attached to the Regiment, and medical care, from being purely a matter for the Captain to organize, became a Regimental responsibility. By this time the practice of surgery had long passed from the hands of monks into those of the barbers. Thus in the seventeenth century the Prussians had _Feldschere_, _Field Barbers_, attached to Companies and Regiments for surgical duties. There also began to be during the sixteenth century a certain number of what we should call _Staff Surgeons_, attached to the Higher Commands, who were supposed to supervise the _Regimental Surgeons_. The latter gradually became better educated, while the _Company Surgeons_ under their supervision remained merely rude subordinates. During the seventeenth century the sick and wounded were treated in tents pitched in the rear of the camp as long as the army was stationary, and tended by some of the women who accompanied it. When it moved, they were handed over to local authorities, or left in the villages near the fighting. An effort was then made in most countries to establish hospitals in the chief towns in the theatre of war, into which the wounded could be collected for better tending. By the eighteenth century Army Surgeons were allotted to these hospitals, which seem first to have been organized in France, where, however, they were managed by contractors. The abuses of this system led to the hospitals being placed under the Intendants of the Army, a change which effected little improvement, as the Intendants, through ignorance and apathy, hampered the action of the medical department, and delayed any improvement in it. France was the first country to organize any sort of mobile hospital, the germ of our _field ambulance_. One ambulance wagon was provided per 1,000 men, and in battle, dressing stations were formed in rear, to which wounded found their way, or were carried on stretchers. Stationary hospitals were also established in rear, and the modern system of evacuation of wounded to the rear was rudely organized. The same idea was started in Austria, and, in a less developed form, in Germany.