The Roman History · Amm. 16.11.8

In these days, also, the barbarians, alarmed at the approach of our armies, which had established their stations on the left bank of the Rhine, employed some part of their force in skilfully barricading the roads, naturally difficult of access, and full of hills, by abattis constructed of large trees cut down; others occupied the numerous islands scattered up and down the Rhone, and with horrid howls poured forth constant reproaches against the Romans and the Cæsar; who, being now more than ever resolved to crush some of their armies, demanded from Barbatio seven of those boats which he had collected, for the purpose of constructing a bridge with them, with the intention of crossing the river. But Barbatio, determined that no assistance should be got from him, burnt them all.

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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