The Roman History · Amm. 18.2.19

But when they also, after their crops and houses had been burnt, and many of their soldiers had been slain or taken prisoners, sent ambassadors of their own, and sued for mercy as if they had been guilty of similar violence to our subjects, they obtained peace on similar terms; of which that most rigorously insisted on was that they should restore all the prisoners which they had taken in their frequent incursions.

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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