The Roman History · Amm. 31.7.11

Therefore when the armies on both sides, advancing more cautiously, at last halted and stood immovable, the warriors, with mutual sternness, surveying each other with fierce looks. The Romans in every part of their line sang warlike songs, with a voice rising from a lower to a higher key, which they call barritus, and so encouraged themselves to gallant exertions. But the barbarians, with dissonant clamour, shouted out the praises of their ancestors, and amid their various discordant cries, tried occasional light skirmishes.

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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