Battle of Trafalgar: British Navy under Admiral Nelson defeats allied French and Spanish navies (west of Cape Trafalgar, Trafalgar, Spain).
Score: The British sink 22 ships. Their adversaries, none.
London gets Trafalgar Square and a new iconic hero, Lord Nelson.
Trafalgar was part of the War of the Third Coalition (a segment of the Napoleonic Wars just–noted above) and was a pivotal 19th century naval battle (Nelson was killed in the battle).
– after Wikipedia