Ammianus Marcellinus Res Gestae 31.5.9

[9] Against them Lupicinus mustered all his soldiers in tumultuous speed, and advancing with more haste than discretion, halted nine miles from the city, ready to join battle. On seeing this the barbarians rushed recklessly ¹ on crowds of our men, dashed their shield’s upon opponents’ bodies, ² and with lance and sword ran through those who opposed them. And in the press of mad and bloody strife the tribunes and the greater part of the army perished, with the loss of their standards, except for their ill-omened leader, who, intent only upon saving himself by flight while the others were fighting, made for the town in hot haste. After this the enemy put on the Romans’ arms and ranged about, devastating sundry places without opposition.