The Roman History · Amm. 28.2.1

Valentinian having several great and useful projects in his head, began to fortify the entire banks of the Rhine, from its beginning in the Tyrol to the straits of the ocean, with vast works; raising lofty castles and fortresses, and a perfect range of towers in every suitable place, so as to protect the whole frontier of Gaul; and sometimes, by constructing works on the other side of the river, he almost trenched upon the territories of the enemy.

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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