The Roman History · Amm. 24.4.9

Some of them were overtaken, and on their resistance were put to death by our soldiers, who, traversing various districts in barks and small boats, brought in from time to time many prisoners. For it had been cleverly arranged that, while the infantry was besieging the town, the squadrons of cavalry should scour the country in small bands in order to bring in booty. And by this system, without doing any injury to the inhabitants of the provinces, the soldiers fed on the bowels of the enemy.

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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