WThe Tonnant class was a series of eight 80-gun ships of the line designed in 1787 by Jacques-Noël Sané, whose plans for the prototype were approved on 29 September 1787. With sixteen gunports on the lower deck on each side these were the most effective two-deckers of their era. Their broadside of 1,102 livres equated to 1,190 British pounds weight, over 50% more than the standard British 74-gun ship, and even greater than that of a British 100-gun three-decker.
WFormidable was an 80-gun Tonnant-class ship of the line of the French Navy, laid down in August 1794 and given the name Formidable, on 5 October, but renamed Figuieres on 4 December 1794, although the name was restored to Formidable on 31 May 1795 after she was launched at Toulon on 17 March 1795. She participated in the Battle of Algeciras, the Battle of Cape Finisterre and several other actions before the British captured her at the Battle of Cape Ortegal on 4 November 1805. The British took her into service as HMS Brave. She was sold to be broken up in April 1816.
WHMS Canopus was an 84-gun third rate ship of the line of the British Royal Navy. She had previously served with the French Navy as the Tonnant-class Franklin, but was captured after less than a year in service by the British fleet under Rear Admiral Horatio Nelson at the Battle of the Nile in 1798. Having served for less than six months for the French from her completion in March 1798 to her capture in August that year, she would eventually serve for 89 years for the British.
WIndivisible was a Tonnant-class 80-gun ship of the line of the French Navy.
WIndomptable ("Indomitable") was a Tonnant-class 80-gun ship of the line in the French Navy, laid down in 1788 and in active service from 1791. Engaged against the Royal Navy after 1794, she was damaged in the Battle of Trafalgar and wrecked near the Spanish city of Cadiz on 24 October 1805.
WHMS Sans Pareil ("Without Equal") was an 80-gun third rate ship of the line of the Royal Navy. She was formerly the French ship Sans Pareil, but was captured in 1794 and spent the rest of her career in service with the British.
WHMS Tonnant was an 80-gun ship of the line of the Royal Navy. She had previously been Tonnant of the French Navy and the lead ship of the Tonnant class. The British captured her in August 1793 during the Siege of Toulon but the French recaptured her when the siege was broken in December. Rear-Admiral Horatio Nelson captured her at Aboukir Bay off the coast of Egypt at the Battle of the Nile on 1 August 1798. She was taken into British service as HMS Tonnant. She went on to fight at the Battle of Trafalgar in 1805, during the Napoleonic Wars.