capture of the Parthian capital, in the manner of Trajan.
Early in 196, before a direct attack could be made on Parthia, Severus was forced to leave the eastern front by the revolt in Gaul of Clodius Albinus, who was eventually defeated and killed in 197. With the Emperor absent and the Roman power weakened by civil war, Vologases swept rapidly northward through Mesopotamia. Nisibis was saved only by the desperate defense of Laetus, who was besieged within the city, and even Armenia may have been retaken.[1]
The Roman successes had apparently crystallized revolutionary sentiment in Iran, and definite action was probably begun by the Medes and the people of Persis[2] before the withdrawal of Severus. Vologases with a large army advanced against the enemy, whom he met in Khorasan. After crossing a small river his forces found themselves surrounded on all sides. Taken by surprise they were forced to abandon their horses and retreat, but the rebels cornered them in the mountains and killed a great number. At last the loyal Parthian troops managed to reorganize, fall upon their pursuers with great fury, and drive them as far as the sea (the Caspian?). Homeward bound after this victory, the army of Vologases met a rebel contingent which had become separated from the
