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 on 10 September 1813. The British Army, along with militia and Indian units, was now cut off from supplies and retreated eastward. They were caught and defeated at the Battle of the Thames on 5 October 1813, which gave Americans the control over western Ontario, and destroyed the Indian alliance the British Army had depended upon. In 1814 the British Army, bringing in veteran units from the Peninsular War, launched a major invasion of New York State under General Sir George Prévost. However, the supporting Royal Navy vessels on Lake Champlain were sunk by the American fleet at the Battle