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
Captain (Royal Navy) Captain (Royal Navy) Captain (Capt) is a senior officer rank of the Royal Navy. It ranks above commander and below commodore and has a NATO ranking code of OF-5. The rank is equivalent to a colonel in the British Army and Royal Marines, and to a group captain in the Royal Air Force. There are similarly named equivalent ranks in the navies of many other countries. In the Royal Navy, the officer in command of any warship of the rank of commander and below is informally referred to as "the captain" on board, even though holding a junior rank, but