What happened to King John’s campaign at La Roche-aux-Moines in 1214?

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John John of England, from an early 14th-century illumination.

King John’s campaign at La Roche-aux-Moines on July 2, 1214, resulted in a defeat that caused his broader military strategy to fail.1

John had organized an international coalition with the goal of reclaiming lands lost to the French king Philip II Augustus. The plan involved John landing in western France to incite revolts in Aquitaine and Anjou and then marching on Paris, while allied forces from the north advanced simultaneously.1

Following his defeat near Angers, John’s momentum was halted, allowing Philip to take the offensive in the north, which culminated in the Battle of Bouvines later that month. These combined failures left John financially and politically weakened, ultimately forcing him to face his barons and accept the Magna Carta in 1215.1