sentences:  Taking advantage of Byzantine confusion, Sassanid forces under Khosrow I (r. 531–579) swiftly counter-attacked and encircled Dara, capturing the city after a four-month siege.At the same time, a smaller Persian army under Adarmahan ravaged Syria, sacking Apamea and a number of other cities.They were only pushed away from Syria proper by a bumbling Byzantine defence near Antioch.