The Tredegar Iron Works, sprawling along the James River, supplied high-quality munitions to the Confederacy during the war. The company also manufactured railroad steam locomotives in the same period. Tredegar is also credited with the production of approximately 10,000 artillery pieces during the war which was about half of the South's total domestic production of artillery between the war years of 1861–1865. The foundry made the 723 tons of armor plating that covered the CSS "Virginia" (the former USS Merrimack), which fought the first battle between ironclad warships in March 1862. The Tredegar works were adjacent to the Richmond Arsenal, which was recommissioned in the lead-up to the war. On Brown's Island, the Confederate States Laboratory was established to consolidate explosives production to an isolated setting in the eventuality of an accidental explosion.