They included this in the ceasefire agreement.
The Barbarian Tribes revered the young master for he had never killed a Barbarian Warrior on the battlefield; he merely knocked them out and set them aside for the soldiers to tie up.
Then they allowed the Barbarian Tribes to redeem their tribal warriors with valuable items.
The reason the Barbarian Tribes were willing to sign the ceasefire agreement with the Ande Kingdom was also because of the young master.
That day, the young master, alone, made his way to the Barbarian Tribes' main camp and found their leader, telling him he wanted to return to the Eternal City and asked the tribal leader to first sign a ceasefire agreement with the Northern Borders.
Upon hearing the young master's words, the tribal leader did not hesitate and immediately agreed.
If it had been any other general from the Ande Kingdom coming to him to sign a ceasefire agreement, it would have been wishful thinking.