What did Horatio Nelson mean by the signal “England expects that every man will do his duty”?

At the Battle of Trafalgar on October 21, 1805, Horatio Nelson signaled the message "England expects that every man will do his duty" to his fleet shortly before engaging the combined French and Spanish forces.1

Rather than a complex tactical instruction, the signal served as a powerful moral imperative intended to inspire his sailors and officers. By invoking the expectation of the nation, Nelson sought to instill a profound sense of individual responsibility and collective resolve among his crew as they prepared for a high-stakes naval engagement. This call to duty emphasized that the outcome of the battle—and the security of England against Napoleon—depended upon the steadfast performance and courage of every person on board. The signal remains one of the most famous expressions of leadership and patriotic commitment in naval history.1