Trusting God With the Mess We've Made

The Canaanite kings form an alliance to go against Israel. One pagan group decides to act outside of the alliance and using theatrics deceives Israel into making a treaty with them. Israel did not consult with God concerning the treaty and put themselves into a dilemma: sin by keeping the treaty, allowing the pagans to live; or sin by breaking the oath. How do they (and we) get out of such a mess?