The Roman History · Amm. 24.2.1

After this we arrived at a fort called Thilutha, situated in the middle of the river on a very high piece of ground, and fortified by nature as if by the art of man. The inhabitants were invited gently, as was best, to surrender, since the height of their fort made it impregnable; but they refused all terms as yet, though they answered that when the Romans had advanced further so as to occupy the interior of the country, they also as an appendage would come over to the conqueror.

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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