CSS Virginia
When the Civil War broke out in 1861, Confederate Secretary of the Navy Stephen R. Mallory was an early enthusiast for the advantages of armor. As he looked upon it, the Confederacy could not match the industrial North in numbers of ships at sea, so they would have to compete by building vessels that individually outclassed those of the Union. Armor would provide the edge. Mallory gathered about himself a group of men who could put his vision into practice, among them John M. Brooke, John L. Porter, and William P. Williamson.
When Mallory’s men searched the South for factories that could build engines to drive the heavy ships that he wanted, they found no place to do it immediately. At the best facility, the Tredegar Iron Works in Richmond, building engines from scratch would take at least a year....
[ Read more ] CSS Virginia
When the Civil War broke out in 1861, Confederate Secretary of the Navy Stephen R. Mallory was an early enthusiast for the advantages of armor. As he looked upon it, the Confederacy could not match the industrial North in numbers of ships at sea, so they would have to compete by building vessels that individually outclassed those of the Union. Armor would provide the edge. Mallory gathered about himself a group of men who could put his vision into practice, among them John M. Brooke, John L. Porter, and William P. Williamson.
When Mallory’s men searched the South for factories that could build engines to drive the heavy ships that he wanted, they found no place to do it immediately. At the best facility, the Tredegar Iron Works in Richmond, building engines from scratch would take at least a year. Upon learning this, Williamson suggested taking the engines from the hulk 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 9 in (230 mm) smooth-bore Dahlgrens, two 6.4 in (160 mm) and two 7 in (180 mm) 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 1 in (25 mm) thick, was replaced by double plates, each 2 in (51 mm) thick, backed by 24 in (61 cm) 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 CSS Virginia.
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 USS Monitor.
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 small bore that had characterized warships in the past, Ericsson opted for only two guns of large caliber; he wanted to use 15 in (380 mm) guns, but had to settle for 11 in (280 mm) Dahlgren guns when the larger size were unavailable. These were mounted in a cylindrical turret, 20 ft (6.1 m) in diameter, 9 ft (2.7 m) high, covered with iron 8 in (200 mm) thick. The whole rotated on a central spindle, and was moved by a steam engine that could be controlled by one man. Ericsson was afraid that using the full 30 pounds of black powder to fire the huge cannon would raise the risk of an explosion in the turret. He demanded that a charge of 15 pounds be used to lessen this possibility.
As with Virginia, trials found that a full charge would pierce armor plate, a finding that would have affected the outcome of the battle. A serious flaw in the design was the pilot house from which the ship would be conned, a small structure forward of the turret on the main deck. Its presence meant that the guns could not fire directly forward, and it was isolated from other activities on the ship. Despite the late start and the novelty of construction, Monitor was actually completed a few days before her counterpart Virginia, but the Confederates activated Virginia first. |
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