It was agreed between the War and Navy Departments that the Army should take charge of the work of operating docks and providing and loading cargoes and that in the hands of the Navy should lie the responsibility of providing more tonnage when necessary and of equipping, keeping in repair, operating and escorting the transports. To the Navy therefore belongs the credit of having operated with marvelous success for a year and a half an ocean ferry service of enormous proportions across 3,000 miles of submarine infested seas. To call it a ferry service is no exaggeration. For the convoys started so promptly from American shores, moved with such precision across the Atlantic, discharged their passengers and left upon the homeward trip in such good time that the ships came and went upon almost as sure a schedule as that of a ferry across a river. In all, seventy-six groups of transports sailed with troops, the size of a group ranging all the way from a single unescorted ship to as many as fifteen troop ships escorted by from one to four or five cruisers, destroyers and converted yachts. The famous Leviathan, with her capacity for carrying from 9,000 to 11,000 men, made ten such trips, most of them unescorted, her own guns, the skill of her gun crews, the care with which watch was kept and her speed and maneuvering ability being thought to give her ample protection. Trip after trip the Leviathan took with the greatest regularity, steaming down New York Bay with her decks brown with khaki-clad men, speeding across the Atlantic, unloading on the other side and returning to her dock in the New York port promptly in sixteen days. And in eight days more, just as promptly, would she be ready for another trip.