In April, 1862, the Navy Department called Eads to Washington to make designs for more ironclads,--or rather boats made wholly of iron. These were to be of very light draught and turreted. He submitted plans for boats drawing five feet. The department insisted on lighter draught, but still on heavy plating. So he revised his designs once, and then once more. Finally the draught was reduced to only three and a half feet. Eads has himself described his going back to his room in the hotel, and in a few hours making over his designs. When these boats were finished they were found to draw even less than had been contracted for, so that extra armor was ordered for them, and three of them exceeded the contract speed. At first two boats were ordered, later four others. For the turrets Eads submitted designs of his own, but as it was then only a month after the Monitor's fight, Ericsson's turrets were insisted on for the first two boats, although modifications were allowed. As the other four had two turrets each, Eads was allowed on two of them to try one turret of his own, with the guns worked by steam, on condition of replacing them at his own cost with Ericsson's in case of failure. This was the first manipulation of heavy artillery by steam. The guns were fired every forty-five seconds, or seven times as fast as in Ericsson's turrets. In addition to the fourteen gunboats, Eads also converted seven transports into musket-proof "tinclads," and built four mortarboats. "Such men," says Boynton, "deserve a place in history by the side of those who fought our battles." The career of some of the gunboats subsequent to the war is interesting. In 1880 the Chickasaw and the Winnebago, which were two of the six iron boats, and both of which took part in the naval campaign at Mobile, had come into the hands of Peru; and old as they were, they were used very effectively against some of the larger and more modern boats of the Chileans.