Commodore (Royal Navy) Commodore (Royal Navy) Commodore (Cdre) is a rank of the Royal Navy above captain and below rear admiral. It has a NATO ranking code of OF-6. The rank is equivalent to brigadier in the British Army and Royal Marines and to air commodore in the Royal Air Force. The rank of commodore was introduced during the 17th century in November 1674 (though not legally established until 1806). In 1684 the navy introduced two classes of commodore, the first known as a "Commodore Distinction" and the other a "Commodore Ordinary"; these would later evolve into commodores first and second class. In
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