No messenger pigeon can be sent out. All messages cannot be sent in time.
When the Mongolian army chased after Happy and his group into the patrolling area of the Chinese cavaliers, it was only then that the Chinese camp finally reacted to the situation.
Aside from having their main force charge straight into the Chinese camp, the Mongolian army also had two teams numbering to the one hundred thousand quickly block the charges from the Chinese cavaliers attacking them from the flanks. They destroyed the plans of the Chinese cavaliers, who thought that they could intercept the Mongolian army. Then, the Mongolian army drove straight into the Chinese camp, and the entire plains descended into a chaotic battle.
It was a fierce battle, and the martial artists could not interfere with it at all.
Many people were killed within less than a minute when they entered the battlefield, and they did not even know where those weapons came from.