While Du You was engaged in battle here, the Fox People Kingdom in the north also initiated a similar battle. Like Du You, they pressed on with a large number of troops. Of course, as the Holy Fox Kingdom was newly established, it didn't have as many high-tier forces accumulated.
Thus, Du You covertly supported them with a group of griffins, allowing the tier-five forces of the Fox People Kingdom to swiftly amass to four thousand in number, which was twice that of the eldest prince's side, and then they struck all at once.
The result was the same as here; they had completely not expected that during the probing phase, the other side would launch a full-scale attack like madmen, initiating a decisive battle. During the combat, Elsa had also personally participated but had slightly concealed her identity. Elsa certainly did not want to be recognized and surrounded; that would not have boded well.