 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.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.Having accepted the submission of Anah and other important cities of Assyria during the course of his march through the province, Julian at length arrived before the walls of Pirisabora, a city 50 miles from Ctesiphon.