It will thus be seen that Michigan's share in the war did not await the entry of America among the Allies, although it was not until the forces of the country were definitely enlisted that her real contribution, in men and services, was made. With the opening of the great training camps, the alumni, particularly those of more recent years, as well as the students of the University volunteered literally in thousands, and Michigan was soon represented by men and officers in every branch of the service. They were in the first contingent of the expeditionary forces, the Rainbow Division, and figured prominently in the earliest fighting about the St. Mihiel salient, at Cantigny, and later with the Marines at Belleau Wood. Many were of course held in America, to their disgust, to train the new levies under the draft law, while others were assigned particular duties for which their special training had fitted them. Thus we find Michigan represented everywhere in the Medical and Dental Corps, the early engineering battalions, the rapidly evolving work of the signal corps, the military intelligence and censorship divisions, gas warfare and gas defense, publicity, and perhaps above all, the aviation service, for which the young college man seemed peculiarly fitted. There were several Michigan men among the first aviation sections in France; several were killed and others captured in early combats. The arrival of the later contingents brought Michigan men with every division; they were everywhere in the Argonne battle, they were with the famous "lost battalion," and with the American forces included in the British sectors, as well as among the engineers who helped to stop the gap after the disaster to the Fifth British Army. Perhaps the most striking contribution Michigan made towards winning the war was in manning the big naval guns which did more than any one thing to cut the German lines of communication through the gap by Sedan between Longuyon and Montmedy. It is not too much to say that it was the work of these guns, in the hands of the men and officers recruited largely from the two naval divisions who left the University in the spring of 1917, that formed one of the great arguments which led to the Armistice of November 11. These two divisions of about seventy men each were organized in the fall of 1916, and with the entry of the United States in the war were immediately mustered into service with Professors J.R. Hayden of the Department of Political Science and Orange J. McNiel of the Engineering College as the commanding officers. For some time they were held in Ann Arbor, where they were quartered in the Gymnasium, later going to the Great Lakes Training Station for further preparation.