The Roman History · Amm. 18.6.16

Afterwards, as our anxiety increased, we proceeded from thence with as much speed as we could make to Amida, a city celebrated at a later period for the disaster which befel it. And when our scouts had rejoined us there we found in one of their scabbards a scrap of parchment written in cipher, which they had been ordered to convey to us by Procopius, whom I have already spoken of as ambassador to the Persians with the Count Lucillianus; its terms were purposely obscure, lest if the bearers should be taken prisoners, and the sense of the writing understood, materials should be found for fatal mischief.

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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