The Roman History · Amm. 28.3.1

But Theodosius, a general of very famous reputation, departed in high spirits from Augusta, which the ancients used to call Londinium, with an army which he had collected with great energy and skill; bringing a mighty aid to the embarrassed and disturbed fortunes of the Britons. His plan was to seek everywhere favourable situations for laying ambuscades for the barbarians; and to impose no duties on his troops of the performance of which he did not himself cheerfully set the example.

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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