sentences:  Early in 591, an army sent by Bahram was defeated by Khosrow's supporters near Nisibis, and Ctesiphon was subsequently taken for Khosrow by Mahbodh.Having restored Dara to Byzantine control, Khosrow and the "magister militum" of the East Narses led a combined army of Byzantine and Persian troops from Mesopotamia into Azerbaijan to confront Bahram, while a second Byzantine army under the "magister militum" of Armenia John Mystacon staged a pincer movement from the north.At the Battle of Blarathon near Ganzak they decisively defeated Bahram, restoring Khosrow II to power and bringing the war to an end.