The defeat of General Song was, in fact, not undeserved.
He led the Brave Camp to reinforce, and they were all cavalry, considered an elite force. If he had been a bit more cautious and not so eager for achievements, allowing the soldiers, weary from their long journey, to rest and reorganize for a few days, and then cooperating with the border army for a joint attack, they might have defeated the Rouran Cavalry in one stroke.
