The Roman History · Amm. 29.6.13

And as they were hastening onwards with impetuous and vengeful speed, they were met by two legions, the Pannonian and the Mœsian, both of approved valour, who, if they had acted in harmony, must unquestionably have come off victorious. But while they were hastening onward to attack the barbarians separately, a quarrel arose between them on the subject of their honour and dignity, which impeded all their operations.

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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