The Second Battle of Lincoln occurred at Lincoln Castle on Saturday 20 May 1217, during the First Barons' War, between the forces of the future Louis VIII of France and those of King Henry III of England. Louis' forces were attacked by a relief force under the command of William Marshal, 1st Earl of Pembroke. The Comte du Perche, commanding the French troops, was killed and this heavy defeat led to Louis being expelled from his base in the southeast of England. This event is known as "Lincoln Fair" after the looting that took place afterwards.