The disagreements between Edward and the French Crown over the Duchy of Gascony led to the War of Saint-Sardos in 1324. Charles, Edward's brother-in-law, had become King of France in 1322, and was more aggressive than his predecessors. In 1323, he insisted that Edward come to Paris to give homage for Gascony, and demanded that Edward's administrators in Gascony allow French officials there to carry out orders given in Paris. Matters came to a head in October when a group of Edward's soldiers hanged a French sergeant for attempting to build a new fortified town in the Agenais, a contested section of the Gascon border. Edward denied any responsibility for this incident, but relations between Edward and Charles soured. In 1324, Edward dispatched the Earl of Pembroke to Paris to broker a solution, but the earl died suddenly of an illness along the way. Charles mobilised his army and ordered the invasion of Gascony.