His signature and a few lines, cut from an Admiralty letter. 4 x 3 inches, in good condition. Admiralty House, 13 December 1820. Admiral Sir Josias Rowley (1765-1842), known as “The Sweeper of the Seas”, commanded the campaign that captured the French Indian Ocean islands of Réunion and Mauritius in 1810. Rowley served throughout the Napoleonic Wars at Buenos Aires, Montevideo, Mauritius (where he was the senior officer in 1809), the Cape and the Mediterranean. Rowley commanded H.M.S.America from 1811 to 1814. From 1818 to 1821 he was commander-in-chief on the coast of Ireland. Rowley was commander-in-chief in the Mediterranean from December 1833 to February 1837.