Joshua assumed that all he had to do was follow the same game plan that had led to success at Jericho. He sent out spies, they sent back a favorable report. He commissioned the attack.
Then it all went horribly wrong. About 36 dead, and the rest of the 3000 troops come running back in shame.
It took the greed of just one man to turn the table on the Israelites. But the leaders learn a valuable lesson. God is not with you simply because you are doing the same things you did last time. It is his battle. He must set the pace.
LORD, help us to seek your face before we try to win your victory. Deliver us from presumption that might lead to another valley of trouble.