Ironically for a vessel designed to engage enemy battleships, her only significant action was the ramming and sinking of German submarine , becoming the only battleship confirmed to have sunk a submarine. "Dreadnought" did not participate in the Battle of Jutland in 1916 as she was being refitted. Nor did "Dreadnought" participate in any of the other First World War naval battles. In May 1916 she was relegated to coastal defence duties in the English Channel, not rejoining the Grand Fleet until 1918. The ship was reduced to reserve in 1919 and sold for scrap two years later.