Jehoshaphat resolved to inquire of the Lord, and he proclaimed a fast for all Judah.

 2 Chronicles 20:1-12

Some people came and told Jehoshaphat, “A vast army is coming against you from Edom, from the other side of the Dead Sea. It is already in Hazezon Tamar” (that is, En Gedi). Alarmed, Jehoshaphat resolved to inquire of the Lord, and he proclaimed a fast for all Judah. The people of Judah came together to seek help from the Lord; indeed, they came from every town in Judah to seek him.

But now here are men from Ammon, Moab and Mount Seir, whose territory you would not allow Israel to invade when they came from Egypt; so they turned away from them and did not destroy them. See how they are repaying us by coming to drive us out of the possession you gave us as an inheritance. Our God, will you not judge them? For we have no power to face this vast army that is attacking us. We do not know what to do, but our eyes are on you.”

Why?

King Jehoshaphat confessed he was weak and Judah couldn't face the war from Ammon, Moab, and Seir, He knew the solution was the Lord, so he prayed to the Lord and proclaimed a fast for all Judah.

How?

Under distress situations I know the Lord is my salvation and my hope, only the Lord can help me. Right now I am facing surgery tomorrow morning in the Hospital, I depend on the Lord too.