 Montfort 's coalition began to quickly fragment , Henry regained his freedom of movement and renewed chaos spread across England . Henry appealed to his brother @-@ in @-@ law Louis of France for arbitration in the dispute ; Montfort was initially hostile to this idea , but , as war became more likely again , he decided to agree to French arbitration as well . Initially Montfort 's legal arguments held sway , but in January 1264 , Louis announced the Mise of Amiens , condemning the rebels , upholding the King 's rights and annulling the Provisions of Oxford . The Second Barons ' War finally broke out in April , when Henry led an army into Montfort 's territories . Becoming desperate , Montfort marched in pursuit of Henry and the two armies met at the Battle of Lewes on 14 May . Despite their numerical superiority , Henry 's forces were overwhelmed . Captured , Henry was forced to pardon the rebel barons and reinstate the Provisions of Oxford , leaving him , as historian Adrian Jobson describes , " little more than a figurehead " . 
 Montfort <a href='null_genetive' title='1'><mark>'s</mark></a>coalition began to quickly fragment , Henry regained his freedom of movement and renewed chaos spread across England . Henry appealed to his brother @-@ in @-@ law Louis of France for arbitration in the dispute ; Montfort was initially hostile to this idea , but , as war became more likely again , he decided to agree to French arbitration as well . Initially Montfort <a href='null_genetive' title='2'><mark>'s</mark></a>legal arguments held sway , but in January 1264 , Louis announced the Mise of Amiens , condemning the rebels , upholding the King <a href='null_genetive' title='3'><mark>'s</mark></a>rights and annulling the Provisions of Oxford . The Second Barons <a href='null_genetive' title='4'><mark>'</mark></a>War finally broke out in April , when Henry led an army into Montfort <a href='null_genetive' title='5'><mark>'s</mark></a>territories . Becoming desperate , Montfort marched in pursuit of Henry and the two armies met at the Battle of Lewes on 14 May . Despite their numerical superiority , Henry <a href='null_genetive' title='6'><mark>'s</mark></a>forces <a href='uninflect' title='7'><mark>were</mark></a> overwhelmed . Captured , Henry was forced to pardon the rebel barons and reinstate the Provisions of Oxford , leaving him , as historian Adrian Jobson <a href='uninflect' title='8'><mark>describes</mark></a> , " little more than a figurehead " . 
Montfort  coalition began to quickly fragment , Henry regained his freedom of movement and renewed chaos spread across England . Henry appealed to his homeboy @-@ in @-@ law Louis of France fir arbitration in the dispute ; Montfort was initially hostile to this idea , but , as war became more likely again , he decided to agree to French arbitration as well . Initially Montfort  legal arguments held sway , but in January 1264 , Louis announced the Mise of Amiens , condemning da rebels , upholding tdaKing  rights and annulling the Provisions of Oxford . The Second Barons  War finally broke out in April , when Henry led an army into Montfort  territories . Becoming desperate , Montfort marched in pursuit of Henry and thdawo armies met at thedattle of Lewes on 14 May . Despite their numerical superiority , Henry  forces was overwhelmed . Captured , Henry was forced to pardon the rebel barons and reinstate the Provisions of Oxford , leaving em , as historian Adrian Jobson describe , " lil more than a figurehead " .