 Al-Hasan meanwhile allied with Hasan.During the same time, an officer of Vushmgir named Isfahi, who had recently returned to Tabaristan, not knowing that Vushmgir was gone, quickly discovered it, and went to a fortress, where he fortified himself there.A revolt shortly broke against al-Hasan, who had many of Vushmgir's officer's killed, including Isfahi.