The Iberian, the Arab, and the Goth, who gazed on each other with mutual astonishment, were enlisted in the service of the same prince; and the renowned Alaric acquired, in the school of Theodosius, the knowledge of the art of war, which he afterwards so fatally exerted for the destruction of Rome.
The emperor of the West, or, to speak more properly, his general Arbogastes, was instructed by the misconduct and misfortune of Maximus, how dangerous it might prove to extend the line of defence against a skilful antagonist, who was free to press, or to suspend, to contract, or to multiply, his various methods of attack.

Arbogastes fixed his station on the confines of Italy; the troops of Theodosius were permitted to occupy, without resistance, the provinces of Pannonia, as far as the foot of the Julian Alps; and even the passes of the mountains were negligently, or perhaps artfully, abandoned to the bold invader.
He descended from the hills, and beheld, with some astonishment, the formidable camp of the Gauls and Germans, that covered with arms and tents the open country which extends to the walls of Aquileia, and the banks of the Frigidus, or Cold River.

This narrow theatre of the war, circumscribed by the Alps and the Adriatic, did not allow much room for the operations of military skill; the spirit of Arbogastes would have disdained a pardon; his guilt extinguished the hope of a negotiation; and Theodosius was impatient to satisfy his glory and revenge, by the chastisement of the assassins of Valentinian.

Without weighing the natural and artificial obstacles that opposed his efforts, the emperor of the East immediately attacked the fortifications of his rivals, assigned the post of honorable danger to the Goths, and cherished a secret wish, that the bloody conflict might diminish the pride and numbers of the conquerors.

Ten thousand of those auxiliaries, and Bacurius, general of the Iberians, died bravely on the field of battle.
But the victory was not purchased by their blood; the Gauls maintained their advantage; and the approach of night protected the disorderly flight, or retreat, of the troops of Theodosius.