The rebellion spread through Armenia, including attacks against Arab tax-collectors, and the local Arab governor, al-Hasan ibn Qahtaba, was unable to contain it. The Caliph sent 30,000 Khurasanis under Amir ibn Isma'il into the province, and at the Battle of Bagrevand on 25 April 775, the nakharar suffered a decisive defeat, losing their leaders, Smbat VII Bagratuni and Mushegh VI Mamikonian. After the battle, the revolt was brutally suppressed by the Abbasids.[2][3][4]