Adam Clarke on 2 Kings 6:23

He prepared great provision for them - These, on the return to their master, could tell him strange things about the power of the God of Israel, and the magnanimity of its king.

So the bands of Syria came no more - Marauding parties were no more permitted by the Syrian king to make inroads upon Israel. And it is very likely that for some considerable time after this, there was no war between these two nations. What is mentioned in the next verse was more than a year afterwards.