Right now, the three brothers are with Dai Wei (the one they met in the forest and fought together against demons), and with Royal Teacher Yuang Gen, they are on their way to Province Quanshan as there is where the enemy is staying right now.
When Xiong Delun took the decision of going into the battlefield with his brothers, his father was against it as they are the Prince of this kingdom and it won't be suited for a prince to go to the battlefield when the army is not moving out.
Also, not much information is there on enemy strength so no one knows how strong the enemy is, making it harder for Xiong Song to send his kid to the battlefield,
But Xiong Delun told him that if the reports or the information provided so far is right, then sending soldiers to the battle will be useless and it will only cause more harm to them, and also their soldier's morale would become low
