On 23 May 1430, Philip's troops under the Count of Ligny captured Joan of Arc at Compiègne and later sold her to the English, who orchestrated a heresy trial against her conducted by pro-Burgundian clerics. Despite this action against Joan of Arc, Philip's alliance with England was broken in 1435 when he signed the Treaty of Arras, which completely revoked the Treaty of Troyes and recognised Charles VII as king of France. Philip signed the treaty for a variety of reasons, one of which may have been a desire to be recognised as the preeminent duke in France.