of Merrimack, recently raised from the bed of the Elizabeth River. His colleagues promptly accepted his suggestion and expanded it, proposing that the design of their projected ironclad be adapted to the hull. Porter produced the revised plans, which were submitted to Mallory for approval. On July 11, 1861, the new design was accepted, and work began almost immediately. The burned-out hull was towed into the graving dock that the Union Navy had failed to destroy. During the subsequent conversion process, the plans developed further, incorporating an iron ram fitted to the prow. The re-modeled ship's offense, in addition to the ram, consisted of 10 guns: six smooth-bore Dahlgrens, two and two Brooke rifles. Trials showed that these rifles firing solid shot would pierce up to eight inches of armor plating. The Tredegar Iron works could produce both solid shot and shell, and since it was believed that Virginia would face only wooden ships, she was given only the explosive shell. The armor plating, originally meant to be thick, was replaced by double plates, each thick, backed by of iron and pine. The armor was pierced for 14 gunports: four on each broadside, three forward, and three aft. The revisions, together with the usual problems associated with the transportation system of the South, resulted in delays that pushed out the launch date until February 3, 1862, and she was not commissioned until February 17, bearing the name . USS Monitor Intelligence that the Confederates were working to develop an ironclad caused consternation for the Union, but Secretary of the Navy Gideon Welles waited for Congress to meet to request permission to consider building armored vessels; Congress gave this permission on August 3, 1861. Welles appointed a commission, which became known as the Ironclad Board, of three senior naval officers to choose among the designs that were submitted for consideration. The three men were Captains Joseph Smith, Hiram Paulding, and Commander Charles Henry Davis. The board considered seventeen designs, and chose to support three. The first of the three to be completed, even though she was by far the most radical in design, was Swedish engineer and inventor John Ericsson's . Ericsson's Monitor, which was built at Ericsson's yard on the East River in Greenpoint, Brooklyn, incorporated new and striking design features, the most significant of which were her armor and armament. Instead of the large numbers of guns of rather