Ardaburius received reinforcements[3] and put the fortress of Nisibis under siege. Bahram allied with the Lakhmid Arabs of Alamundarus (Al-Mundhir I of Hirah), who, however, were dispersed by the Romans. In the meantime, the King of the Huns, Rua, had attacked the dioceses of Dacia and Thracia and had even menaced Constantinople; at the same time, a large Persian army moved towards Nisibis.