This letter was returned with an endorsement from General Halleck
, reiterating his continued disapproval of the whole plan of medical organization, in the face of which opposition in high places, no further steps at army headquarters could, for the time, be taken.
But in the mean time, medical officers of independent commands had been endeavoring to improve conditions within the immediate jurisdiction of their commanders, and in the Army of the Potomac, Medical Director Letterman
had convinced General McClellan
, perhaps the ablest organizer in the Northern
forces, of the need for some special provision for the first aid and transportation of wounded.
On August 2, 1862, General McClellan
issued an order embodying Medical Director Letterman
's plan, which was not only the first of its kind but so complete and practical as to have since served as the basis for the organization of the medical service in the field in all the armies of the world.
The order need not be here further discussed than to mention that it organized an ambulance corps with animals, transportation, personnel, and supplies