Maslama commanded the summer expedition against the Byzantine Empire in 739, taking control of al-Matamir, the cavernous southern half of Cappadocia, and besieged and captured Ancyra (modern Ankara).[14] Maslama's victories marked the last Umayyad captures of a Byzantine fortress or town.[14] The following summer the Umayyads launched the largest expedition against the Byzantines during Hisham's reign.[14] The main expedition was led by Maslama's brother Sulayman, and Maslama may have commanded a separate expedition during the same year.[14] The Umayyads raided throughout western Anatolia but were beaten back by the Byzantines without any territorial gains, while two of the Caliphate's leading generals, Abdallah al-Battal and Malik ibn Shu'ayb were slain by the forces of Byzantine emperor Leo III.[14]