The Roman History · Amm. 21.8.4

But he charged them, when they set forth, to march with all speed, as if likely to meet at any moment with an enemy, and carefully to post watches and sentries and outposts at night, so as to be free from the danger of any sudden attack.

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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