When war with France broke out again in 1202, John achieved early victories, but shortages of military resources and his treatment of Norman, Breton and Anjou nobles resulted in the collapse of his empire in northern France in 1204. John spent much of the next decade attempting to regain these lands, raising huge revenues, reforming his armed forces and rebuilding continental alliances. John's judicial reforms had a lasting impact on the English common law system, as well as providing an additional source of revenue. An argument with Pope Innocent III led to John's excommunication in 1209, a dispute finally settled by the king in 1213. John's attempt to defeat Philip in 1214 failed due to the French victory over John's allies at the battle of Bouvines. When he returned to England, John faced a rebellion by many of his barons, who were unhappy with his fiscal policies and his treatment of many of England's most powerful nobles. Although both John and the barons agreed to the Magna Carta peace treaty in 1215, neither side complied with its conditions. Civil war broke out shortly afterwards, with the barons aided by Louis of France. It soon descended into a stalemate. John died of dysentery contracted whilst on campaign in eastern England during late 1216; supporters of his son Henry III went on to achieve victory over Louis and the rebel barons the following year.