The Roman History · Amm. 24.1.13

And because in these unknown districts they were forced to be on unusual guard against hidden dangers, the troops especially feared the craft and exceeding deceitfulness of the enemy; and therefore the emperor was everywhere, sometimes in front, sometimes with his light-armed battalions protecting the rear, in order to see that no concealed danger threatened it, reconnoitring the dense jungles and valleys, and restraining the distant sallies of his soldiers, sometimes with his natural gentleness, and sometimes with threats.

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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