The Roman History · Amm. 19.5.2

We had with us two of the legions which had served under Magnentius, and which, as we have said, had lately been brought from Gaul, composed of brave and active men well adapted for conflicts in the plain; but not only useless for such a kind of war as that by which we were now pressed, but actually in the way. For as they had no skill either in working the engines, or in constructing works, but were continually making foolish sallies, and fighting bravely, they always returned with diminished numbers; doing just as much good, as the saying is, as a bucket of water brought by a single hand to a general conflagration.

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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