The Roman History · Amm. 24.1.7

But as soon as it became light, one of the garrison going out to get water, saw the enemy, and immediately raised an outcry, which roused the awakened garrison to arm in their defence. And presently, from a high watch-tower, the emperor examined the situation of the fort, and came up with all speed escorted by two vessels, and followed by a considerable squadron laden with engines for the siege.

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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