October 21 is Trafalgar Day, the anniversary of the Battle of Trafalgar and the death of England's greatest naval hero, Admiral Horatio Nelson, on 21 October 1805. Fought off the southwest coast of Spain, Trafalgar was the greatest naval victory of the Napoleonic wars and essentially destroyed the sea power of France in a single engagement. Nelson and the British fleet had been blockading the French and Spanish fleet under Villeneuve in Cadiz after pursuing it to the Caribbean and back. When Villeneuve finally emerged to give battle, Nelson, depending on the superior seamanship and fighting skill of his "band...