The Roman History · Amm. 21.12.15

But as, through the greatness of the difficulties in their way, they could not accomplish this, they began to slacken their exertions as to the siege itself, and leaving a few watches and outposts, ravaged the adjacent country, and thus obtained all kinds of supplies, dividing their booty with their comrades. The consequence was, that excessive eating and drinking proved injurious to their health.

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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