Historically, the Frankish tribe was able to defeat the Visigothic Kingdom by allying with the Empire's army; Europe has always had this tradition of uniting to confront formidable enemies.
The Visigothic Kingdom could muster at least seventy to eighty thousand troops with full force. Moreover, Orléans is very close to the island of France, so now it can be said that the army is directly targeting the city, with only the distance of a neighboring county between the two places. Duncan leading elite cavalry to support the empress and princesses was indeed a risky move. After all, if Torismund were to find out, he would likely seize the opportunity to launch an attack.
The gap in national power is not something that can be bridged overnight.
