Winter campaigns were unusual and the Damascus campaign is often seen as delayed by unknown factors. Hugh did not arrive in the Kingdom of Jerusalem until several months after the Council of Troyes, which Christopher Tyerman cites as a possible cause of the delay. On the other hand, the campaign is sometimes seen as hastened rather than delayed. This depends on the claim by Ibn al-Athīr that Baldwin II had negotiated an agreement with conspirators within Damascus to hand the city over to him. On a specified Friday, the vizier of Damascus, Abū ʿAlī Ṭāhir ibn Saʿd al-Mazdaqānī, was to lock the people in the mosque and open the gates to the crusaders. In return, the vizier would be given the city of Tyre, which had only recently been conquered for the Kingdom of Jerusalem by the Crusade of 1122–1124.