The Roman History · Amm. 26.8.3

At last, being worn out by the scarcity of supplies and the exceeding obstinacy of the garrison, he was preparing to raise the siege, when the garrison who were shut up in Nicæa suddenly opened the gates and issued forth, destroying a great portion of the works of the besiegers, and under the command of the faithful Rumitalca hastened on eagerly in the hope of cutting off Valens, who had not yet quitted the suburb of Chalcedon. And they would have succeeded in their attempt if he had not learnt the imminence of his danger from some rumour, and eluded the enemy who were pressing on his track, by departing with all speed by a road lying between the lake Sunon and the winding course of the river Gallus. And through this circumstance Bithynia also fell into the hands of Procopius.

Ammianus Marcellinus · translated by C. D. Yonge · 1911 reprint
C. D. Yonge translation (preface dated February 1862); G. Bell and Sons, 1911; Project Gutenberg #28587
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