The Roman History · Amm. 17.1.3

The barbarians, amazed at the greatness of his enterprise, inasmuch as they had fancied they were situated in a position in which they could hardly be disturbed, were now led by the destruction of their countrymen to think anxiously of their own future fate, and accordingly, pretending to implore peace that they might escape from the violence of his first invasion, they sent ambassadors to him with a set message, offering a lasting treaty of agreement; but (though it is not known what design or change of circumstances altered their purpose) they immediately afterwards sent off some others with all speed, to threaten our troops with implacable war if they did not at once quit their territories.

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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