Read 2 Kings 3 today.

This chapter includes the story of a coalition including Israel (northern tribes), Judah (southern tribes), and Edom attacking Moab. The king of Israel initiated the attack because the Moabites stopped paying their tribute to Israel. The three parties of the coalition had already made significant investment in this endeavor before anyone thought to pause long enough to ask the will of God in this matter.
We can easily make the same mistake. Do we spend time with God when we are facing big decisions? Or is doing so an afterthought? How big must the decision be in order for us to pause long enough to pray about it? And when we pray about a decision, is our prayer that God will bless what we have already decided to do, or that God will provide direction (even if it differs from our existing plans) we will actually follow?
2 Kings 3:9-12 NLT
The king of Edom and his troops joined them, and all three armies traveled along a roundabout route through the wilderness for seven days. But there was no water for the men or their animals. [10] “What should we do?” the king of Israel cried out. “The LORD has brought the three of us here to let the king of Moab defeat us.” [11] But King Jehoshaphat of Judah asked, “Is there no prophet of the LORD with us? If there is, we can ask the LORD what to do through him.” One of King Joram’s officers replied, “Elisha son of Shaphat is here. He used to be Elijah’s personal assistant.” [12] Jehoshaphat said, “Yes, the LORD speaks through him.” So the king of Israel, King Jehoshaphat of Judah, and the king of Edom went to consult with Elisha.