There were rumours that Montfort's son Simon the Younger was planning an invasion of England from Normandy, and this was the hope that the rebels hung on to. It was in this situation that the papal legate Ottobuono Fieschi exerted his influence, to make the king pursue a more conciliatory policy.
At Christmas, he came to terms with Simon the Younger and his associates at the Isle of Axholme in Lincolnshire, and in March he led a successful assault on the Cinque Ports.
When he and his brother Thomas fell out with Simon's sons Henry, Simon the Younger, and Guy, they deserted the reforming cause and joined Edward.
Montfort himself had crossed the Severn with his army, intending to rendezvous with his son Simon the Younger.
De Montfort's goal now became to unite with the forces of his son Simon the Younger, and engage with the royal army, but the younger Simon moved much too slowly westwards from London.