Union Navy the set of Army ranks. The most visible change was that henceforth some individuals would be designated commodore, rear admiral, vice admiral, and finally admiral, all new formal ranks, and equivalent to, respectively, brigadier general, major general, lieutenant general, and general. A doctrinal shift took place at the same time. Prior to the war, the United States Navy emphasized single-ship operations, but the nature of the conflict soon made use of whole fleets necessary. Already at the Battle of Port Royal (7 November 1861), 77 vessels, including 19 warships, were employed. This was the largest naval expedition that had ever
History of the Royal Navy and stories of the Royal Navy at this period have been told and retold regularly since then, most famously in the Horatio Hornblower series of C. S. Forrester. In the years following the battle of Trafalgar there was increasing tension at sea between Britain and the United States. American traders took advantage of their country's neutrality to trade with both the French-controlled parts of Europe, and Britain. Both France and Britain tried to prevent each other's trade, but only the Royal Navy was in a position to enforce a blockade. Another irritant was the suspected presence of British deserters aboard