The alternative which Ammianus suggests--that Jovian, instead of negotiating, should have pushed on to Cordyene, which he might have reached in four days--is absurd; for Cordyeno was at least a hundred and fifty miles distant from Dura, and, at the rate of retreat which Jovian had found possible (four and a half miles a day), would have been reached in three days over a month! The judgment of Eutropius, who, like Ammianus, shared in the expedition, is probably correct--that the peace, though disgraceful, was necessary.

Unless Jovian was prepared to risk not only his own life, but the lives of all his soldiers, it was essential that he should come to terms; and the best terms that he could obtain were those which he has been blamed for accepting.
It is creditable to both parties that the peace, once made, was faithfully observed, all its stipulations being honestly and speedily executed.

The Romans were allowed to pass the river without molestation from Sapor's army, and, though they suffered somewhat from the Saracens when landing on the other side, were unpursued in their retreat, and were perhaps even, at first, supplied to some extent with provisions.
Afterwards, no doubt, they endured for some days great privations; but a convoy with stores was allowed to advance from Roman Mesopotamia into Persian territory, which met the famished soldiers at a Persian military post, called Ur or Adur, and relieved their most pressing necessities.
On the Roman side, the ceded provinces and towns were quietly surrendered; offers on the part of the inhabitants to hold their own against the Persians without Roman aid were refused; the Roman troops were withdrawn from the fortresses; and the Armenians were told that they must henceforth rely upon themselves, and not look to Rome for help or protection.

Thus Jovian, though strongly urged to follow ancient precedent, and refuse to fulfil the engagements contracted under the pressure of imminent peril, stood firm, and honorably performed all the conditions of the treaty.

The second period of struggle between Rome and Persia had thus a termination exactly the reverse of the first.
Rome ended the first period by a great victory and a great diplomatic success.