The Despenser family, in particular Hugh Despenser the Younger, became close friends and advisers to Edward, but Lancaster and many of the barons seized the Despensers' lands in 1321, and forced the king to exile them. In response, Edward led a short military campaign, capturing and executing Lancaster. Edward and the Despensers strengthened their grip on power, formally revoking the 1311 reforms, executing their enemies and confiscating estates. Unable to make progress in Scotland, Edward finally signed a truce with Bruce. Opposition to the regime grew, and when Isabella was sent to France to negotiate a peace treaty in 1325, she turned against Edward and refused to return. Instead, she allied herself with the exiled Roger Mortimer, and invaded England with a small army in 1326. Edward's regime collapsed and he fled to Wales, where he was captured in November. The king was forced to relinquish his crown in January 1327 in favour of his 14-year-old son, and he died in Berkeley Castle on 21 September, probably murdered on the orders of the new regime.