The Roman History · Amm. 18.2.10

And the enemy, watching his movements with great skill, marched slowly along the opposite bank, and when they saw our men pitching their tents at a distance, they still watched all night, exerting the most sleepless vigilance to prevent the passage of the river from being attempted.

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
Passage preview. Read in context for the complete text, notes and references.