These letters were written by a member of the American Ambulance Field Service in France, a voluntary organisation that came into existence soon after the outbreak of war and in 1916 had over 200 motor ambulances. They were driven by young American volunteers, most of them graduates of American universities, who got no salary but their living expenses were paid. The ambulances were grouped in sections of twenty to thirty vehicles, attached to the French Armies and carried the wounded between the front and Army Hospitals within the Army zone. They were particularly useful in Alsace where their light but powerful vehicles were able to cope with the steep mountain passes which French motor ambulances could not manage. The section in which the writer of these letters served and whose daily life and activities he describes was located in Lorraine. The letters cover a period of four months from June to October 1915 and were first published in 1915 under the title With the American Ambulance Field Service in France, changed to Ambulance No 10 for this 1916 edition, purely for the sake of brevity. There is plenty of action to read about in this correspondence and there are interesting photographs.