Which British leader signaled to his troops "England expects that every man will do his duty"?

"England expects that every man will do his duty" was a signal sent by Vice Admiral of the Royal Navy, Horatio Nelson, 1st Viscount Nelson, from his flagship HMS Victory as the Battle of Trafalgar was about to commence on 21 October 1805. Trafalgar was a decisive naval engagement of the Napoleonic Wars. It gave the United Kingdom control of the seas, removing all possibility of a French invasion and conquest of Britain. Although there was much confusion surrounding the wording of the signal in the aftermath of the battle, the significance of the victory and Nelson's death during the battle led to the phrase becoming embedded in the English psyche, and it has been regularly quoted, paraphrased and referenced up to the modern day.

Admiral Horatio Nelson, 1st Viscount Nelson, 1st Duke of Bronté (29 September 1758 – 21 October 1805) was a British flag officer in the Royal Navy. He was noted for his inspirational leadership, grasp of strategy, and unconventional tactics, which together resulted in a number of decisive British naval victories, particularly during the Napoleonic Wars. He was wounded several times in combat, losing the sight in one eye in Corsica at the age of 36, as well as most of one arm in the unsuccessful attempt to conquer Santa Cruz de Tenerife when he was 40 years of age. He was shot and killed at the age of 47 during his final victory at the Battle of Trafalgar near the Spanish port city of Cádiz in 1805.