Kent, a fortification held by Bartholomew de Badlesmere, steward of the King's household who had by 1321 joined the ranks of Edward's opponents. Some historians believe that the pilgrimage was a deliberate act by Isabella on Edward's behalf to create a casus belli. Lord Badlesmere was away at the time, having left his wife Margaret de Clare, Baroness Badlesmere in charge of the castle. When the latter adamantly refused the Queen admittance, fighting broke out outside the castle between Isabella's guards and the garrison, marking the beginning of the Despenser War. Whilst Edward mobilised his own faction and placed Leeds Castle under siege, Isabella was given the Great Seal and assumed control of the royal Chancery from the Tower of London. After surrendering to Edward's forces on 31 October 1321, Margaret, Baroness Badlesmere and her children were sent to the Tower, and 13 of the Leeds garrison were hanged. By January 1322, Edward's army, reinforced by the Despensers returning from exile, had forced the surrender of the Mortimers, and by March Lancaster himself had been captured after the Battle of Boroughbridge; Lancaster was promptly executed, leaving Edward and the Despensers victorious. Hugh Despenser the Younger was now firmly ensconced as Edward's new favourite and together over the next four years Edward and the Despensers imposed a harsh rule over England, a "sweeping revenge" characterised by land confiscation, large-scale imprisonment, executions and the punishment of extended family members, including women and the elderly. This was condemned by contemporary chroniclers, and is felt to have caused concern to Isabella as well; some of those widows being persecuted included her friends. Isabella's relationship with Despenser the Younger continued to deteriorate; the Despensers refused to pay her monies owed to her, or return her castles at Marlborough and Devizes. Indeed, various authors have suggested that there is evidence that Hugh Despenser the Younger attempted to assault Isabella herself in some fashion. Certainly, immediately after the Battle of Boroughbridge, Edward began to be markedly less generous in his gifts towards Isabella, and none of the spoils of the war were awarded to her. Worse still, later in the year Isabella was caught up in the failure of another of Edward's campaigns in Scotland, in a way that permanently poisoned her relationship with both Edward and the Despensers. Isabella and Edward had travelled north together at the start of the autumn campaign; before the disastrous Battle