From there they moved again and camped on the north side of the Arnon River, in the wilderness which extends into Amorite territory. (The Arnon was the border between the Moabites and the Amorites.)
“After we had passed through Moab, the Lord told us, ‘Now, start out and cross the Arnon River. I am placing in your power Sihon, the Amorite king of Heshbon, along with his land. Attack him, and begin occupying his land.
The sun stood still and the moon did not move until the nation had conquered its enemies. This is written in The Book of Jashar. The sun stood still in the middle of the sky and did not go down for a whole day.
Then Saul said to David, “Here is my older daughter Merab. I will give her to you as your wife on condition that you serve me as a brave and loyal soldier, and fight the Lord's battles.” (Saul was thinking that in this way the Philistines would kill David, and he would not have to do it himself.)