The key here lies in grasping the degree.
Jiang Dali knew that the Mongolian army was known for its ferocity and bravery, and simple goodwill would not have much effect; instead, it might provoke the Mongolian army to launch a large-scale battle.
Only as it is now, by showing an attitude of first etiquette then soldiers, stabilizing the many high-ranking leaders of the Mongolian army, then suddenly attacking and gathering people to surround the Mongolian military camp, creating a situation of 'shaking the mountain to frighten the tiger,' fostering a tense atmosphere as if a major battle is about to unfold, and keeping the initiative firmly in hand.
As a result, the Mongolian army will feel indignant and caught off guard, while the high-ranking Mongolian officials will convey his intentions to Si Mengba as fast as possible.
