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Diplomacy

Following the Battle of Agincourt, King Sigismund of Hungary (later Holy Roman Emperor) made a visit to Henry in hopes of making peace between England and France. His goal was to persuade Henry to modify his demands against the French. Henry lavishly entertained him and even had him enrolled in the Order of the Garter. Sigismund, in turn, inducted Henry into the Order of the Dragon. Henry had intended to crusade for the order after uniting the English and French thrones, but he died before fulfilling his plans. Sigismund left England several months later, having signed the Treaty of Canterbury acknowledging English claims to France.

Command of the sea was secured by driving the Genoese allies of the French out of the English Channel. While Henry was occupied with peace negotiations in 1416, a French and Genoese fleet surrounded the harbour at the English-garrisoned Harfleur. A French land force also besieged the town. In March 1416 a raiding force of soldiers under the Earl of Dorset, Thomas Beaufort, was attacked and narrowly escaped defeat at the Battle of Valmont after a counterattack by the garrison of Harfleur. To relieve the town, Henry sent his brother, John, Duke of Bedford, who raised a fleet and set sail from Beachy Head on 14 August. The Franco-Genoese fleet was defeated the following day after the gruelling seven-hour Battle of the Seine and Harfleur was relieved. Diplomacy successfully detached Emperor Sigismund from supporting France, and the Treaty of Canterbury — also signed in August 1416 — confirmed a short-lived alliance between England and the Holy Roman Empire.