The book of Joshua begins with God instructing Joshua to lead the Israelites across the Jordan River into the land that would be given to them. The Israelites conquer the city of Jericho and other cities, but their disobedience leads to defeat and punishment. After discovering the disobedience of Achan, the Israelites are able to conquer Ai and then go on to defeat other cities and kings. The Israelites divide the land among the tribes, with Joshua giving Caleb the mountain that the Lord had promised him. The book concludes with Joshua's old age, where he gathers the leaders of Israel and reminds them of God's victories and promises, warning them to follow the law of Moses and not turn to the gods of the surrounding nations.