After some failed attempts, the Romans began to construct a siege tower, after which Mamersides reached a compromise with Julian to hand over the fort in exchange for a safe withdrawal.
[3] Upon his arrival at Carrhae, Julian sent his generals, Procopius and Sebastianus, with 30,000 men into Armenia to join up with Arshak II's army of 24,000.
[4] At the same time the main body under Julian himself wheeled south, reaching the Euphrates at Callinicum, whence he directed his march south-east along the river towards Ctesiphon, the winter capital of the Sassanids.
Garrisoned by a strong detachment of the Persians under Mamersides (per Ammianus), or Momoseiros (per Zosimus), the city maintained a stout defense.
Pirisabora was burnt and mercilessly ravaged by the soldiery, who well remembered the treatment of the Persians towards Amida, after its capture four years previously (A.D. 359).