When all Israel saw that the king did not listen to them the people answered the king, saying,
“What portion do we have in David?
We have no inheritance in the son of Jesse.
Every man to your tents, O Israel;
Now look after your own house, David.”
So all Israel departed to their tents.

The Lord was with Jehoshaphat because he followed the example of his father David’s earlier days and did not seek the Baals,

Then Jehoiada the priest gave to the captains of hundreds the spears and the large and small shields which had been King David’s, which were in the house of God.