V.1-5 We have read how that David’s power spread far and wide. We are reading of some who were suspicious of David’s motives, and shamefully treated his messengers. This story is quite a contrast with poor crippled Mephibosheth (2 Sam. 9).
V.6-19 This treatment led to defeat for these people.
It helps us to understand better when we remember that all this is a shadow of the time when the Lord Jesus will come in power and great glory (see your chart) at the end of the tribulation. At that time the nations shall act toward Him in different ways. One by one He will destroy them. In Psalm 18:36-45 the same facts are brought out.