Within a short time they were assigned to the various rifle ranges which were being established up and down the Atlantic coast by Major Harllee of the Marine Corps and given intensive training in gunnery. So well did they show up in this specialized task, for intensive training in marksmanship was one of the Navy's great needs, that little squads of the men were sent everywhere to install and open up new ranges. Meanwhile the need of big guns on the French front was becoming more and more apparent and one officer, Captain, and later Admiral, Plunkett bethought him of a number of great 14-inch navy guns which were not in use. He conceived the idea of mounting these on railway carriages and making great mobile batteries of them. At first he was laughed at; it was impossible to make heavy enough trucks to carry such a weight; and then, where were the expert men to man them? He replied that he knew where he could get the men and called in experts to design the carriages. The result was that in just fifty days the first gun was successfully fired from the railway mounting at the proving ground at Sandy Hook, by the Michigan Naval Volunteers. When the guns were shipped to France all the Michigan men available were sent with them and formed the effective nucleus of every crew. They wore the marine uniform with naval insignia and were under naval discipline throughout; they went "fore" and "aft" on the great trains which accompanied each gun, pointed their pieces to "port" and "starboard" and were rated according to navy ranking. Their great task came when the guns with their equipment first landed at St. Nazaire. Not only was it necessary to assemble the guns, but also the locomotives and accompanying armored cars. All of this work was done by the men of the two units as officers and petty officers. When these guns finally got into action, they outranged every battery on any front and, striking at the German railway lines of communication, now from this point and then that, they threw the whole "neck of the bottle" toward which the American forces were driving into hopeless confusion. Of the men in these two battalions over sixty percent received commissions, and of the others, almost all held high ratings as petty officers with responsibilities ordinarily only assumed by commissioned officers.