The united armies were commanded to assemble in a large plain near the city.

In the centre, according to the rules of ancient discipline, a military tribunal, or rather scaffold, was erected, from whence the emperors were accustomed, on solemn and important occasions, to harangue the troops.

The well-ordered ranks of Romans and Barbarians, with drawn swords, or with erected spears, the squadrons of cavalry, and the cohorts of infantry, distinguished by the variety of their arms and ensigns, formed an immense circle round the tribunal; and the attentive silence which they preserved was sometimes interrupted by loud bursts of clamor or of applause.

In the presence of this formidable assembly, the two emperors were called upon to explain the situation of public affairs: the precedency of rank was yielded to the royal birth of Constantius; and though he was indifferently skilled in the arts of rhetoric, he acquitted himself, under these difficult circumstances, with firmness, dexterity, and eloquence.

The first part of his oration seemed to be pointed only against the tyrant of Gaul; but while he tragically lamented the cruel murder of Constans, he insinuated, that none, except a brother, could claim a right to the succession of his brother.