By dint of such skill and energy as we have described, Mr. Eads, in the brief period of one hundred days, built and had ready for service a powerful iron-clad fleet of eight steamers, carrying one hundred and seven heavy guns, and having an aggregate capacity of five thousand tons. Such a work was one of the greatest in magnitude ever performed, and, as may be supposed, required a heavy capital to carry it to perfection. Mr. Eads soon exhausted his own means, and but for the assistance of friends, whose confidence in his integrity and capacity induced them to advance him large sums, would have been compelled to abandon the undertaking; for the Government, upon various pretexts, delayed for months the stipulated payments, and by its criminal negligence came near bringing the iron-clad fleet, so necessary to its success, to an untimely end. It was prompt enough, however, to commission the vessels as soon as they were ready. At the time they rendered such good service in the conquest of Forts Henry and Donelson, and compelled the fall of Island No. 10, they were still unpaid for, and the private property of Mr. Eads. In the spring of 1862, Mr. Eads, in accordance with the desire of the Navy Department, submitted plans for light-draught armored vessels for service on the western rivers. He proposed an ingenious revolving turret to be used on these vessels, the performance of which he agreed to guarantee to the satisfaction of the Department; but the Government decided to use the Ericsson turret, which the recent encounter between the Monitor and Merrimac had proved to be a success. Mr. Eads was allowed, however, to modify the Ericsson turret considerably, in order to avoid making the draft of his steamers greater than was desired. He built the "Osage" and "Neosho," and when these vessels were launched, with all their weight on board, it was found that they were really lighter than the contract called for, a circumstance which permitted the thickness of their armor to be afterward increased half an inch without injuring their draught or speed. In May, 1862, at the request of the Navy Department, Mr. Eads submitted plans for four iron-clads, iron hull propellers, to carry two turrets each of eight inches thickness, four eleven inch guns, and three-quarters inch deck armor, to steam nine nautical miles per hour, to carry three days' coal, and not to exceed a draught of six feet of water. His plans were accepted, and he constructed the "Winnebago," "Kickapoo," "Milwaukee," and "Chickasaw." Like the "Osage" and "Neosho," these vessels were found to be of lighter draught than had been agreed upon, and the Department ordered all four to have an extra plating of three-quarters inch armor, which was done. Three of the vessels were also reported, by the officers of the navy sent to examine them, to exceed the speed required by the contract, while the fourth was fully up to the standard.