 Complete the following phrase:  Despite the momentary respite delivered by Isabella, by the autumn of 1321, the tensions between the two factions of Edward, Isabella and the Despenser, opposing the baronial opposition led by Thomas of Lancaster, were extremely high, with forces still mobilised across the country. At this point, Isabella undertook a pilgrimage to Canterbury, during which she left the traditional route to stop at Leeds Castle in Kent, a fortification held by Bartholomew de Badlesmere, steward of the Kings household who had by 1321 joined the ranks of Edwards opponents. Some historians believe that the pilgrimage was a deliberate act by Isabella on Edwards 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 Isabellas guards and the garrison, marking the beginning of the 