At the end of his life, Joshua gave a farewell speech to the people of Israel, exhorting them to remember God’s faithfulness in order to trust and obey Him.
The story of Joshua and the battle of Jericho demonstrates that victory ultimately belongs to God. Even when we do not understand God, we must obey Him.
God does not do the same thing twice in the same way. The book of Joshua teaches us that He calls us to obedience, not to reliance on presuppositions. This means that when He calls us to do something unexpected, we must submit to Him and trust Him.
Ken Boa teaches on the conquest of Canaan, described in the first six chapters of Joshua, and an act that would be achieved in God's own power, not in the Israelites' strength.