Late Roman Army during the 5th century

[Flavivs Aetivs]

I too have theorized that letting the Visigoths take the brunt of the Battle at chalons was a play by Aetius - let the Battle-Hardened and Veteran Roman army sit up on the Hill,

But the Roman regulars initially advanced to seize the hill, instead of sitting quietly in reserve somewhere.

The Visigoths advanced first, followed by the Roman Army, and then followed by the huns and the Allies' motly center. The Romans set up a shieldwall/Fulcrum on top of the hill and let the Gepids charge the their formation, eventually fighting them off. No clue what the Barbarains did, besides the cavalry combat betweent he gothic groups (the Tervingi/Grethungi/Radagasian goths that became the Visigoths of Aquitaine and the Amailic and other gothic groups that become the ostrogoths in the 460s/70s.)

Theodoric dies, goths route and regroupe, in the meantime the Huns break the center. The regrouped goths attack the left hunnic flank while Aetius comes accross the ridge and attacks the right hunnic flank, the huns are trapped between and are forced to route back to attila's camp. The goths pursue but take cavalries while besieging the camp. Aetius is lost in the confusion but manages to make his way to the Visigothic camp where he spends the night (likely on purpose to convince thorismund to return to aquitaine.)