In 1415, Henry embarked on war with France in the ongoing Hundred Years' War (1337–1453) between the two nations. His military successes culminated in his famous victory at the Battle of Agincourt (1415) and saw him come close to conquering France. Taking advantage of political divisions within France, he conquered large portions of the kingdom, resulting in Normandy's occupation by the English for the first time since 1345–1360. After months of negotiation with Charles VI of France, the Treaty of Troyes (1420) recognised Henry V as regent and heir apparent to the French throne, and he was subsequently married to Charles's daughter, Catherine of Valois. Everything seemed to point to the formation of a union between the kingdoms, in the person of Henry. However, he died two years later and was succeeded by his only child, the infant Henry VI.