While these things were being vigorously carried out in Gaul, that savage king of the Persians, since the urgency of Antoninus was doubled by the coming of Craugasius,See xviii. 10, 1. burned with the desire of gaining possession of Mesopotamia while Constantius was busy at a distance with his army. So, having increased his arms and his power and crossed the Tigris in due form, he proceeded to attack Singara, a town which, in the opinion of those who had charge of that region, was abundantly fortified with soldiers and with all necessities.

The defenders of the city, as soon as they saw the enemy a long way off, quickly closed the gates and full of courage ran to the various towers and battlements, and got together stones and engines of war; then, when everything was prepared, they all stood fast under arms, ready to repulse the horde, in case it should try to come near the walls.