The Roman History · Amm. 17.13.3

And therefore, suspecting that the weight of war was about to fall upon them, they were prepared, as exigency might require, to resort to stratagem, arms, or entreaties. But at the first sight of our army they became as it were panic-stricken; and being reduced to despair, they begged their lives, offering a yearly tribute, and a body of their chosen youths for our army, and promising perpetual obedience. But they were prepared to refuse if they were ordered to emigrate (as they showed by their gestures and countenances), trusting to the strength of the place where, after they had expelled their masters, they had fixed their abode.

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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