Ammianus Marcellinus Res Gestae 16.12.49

[49] And so there suddenly leaped forth a fiery band of nobles, among whom even the kings fought, and with the common soldiers following they burst in upon our lines before the rest; and opening up a path for themselves they got as far as the legion of the Primani, ¹ which was stationed in the centrea strong feature called praetorian camp; there our soldiers, closely packed and in fully-manned lines. stood their ground fast and firm, like towers, ² and renewed the battle with greater vigour; and being intent upon avoiding wounds, they protected themselves like murmillos, ³ and with drawn swords pierced the enemy’s sides, left bare by their frenzied rage.