The theme of Joshua 8-9 is Victory and Deceit. In chapter 8, Israel defeats the city of Ai with an ambush, following God’s instructions, and renews the covenant at Mount Ebal by building an altar and reading God’s Law. This victory came after Achan’s sin was addressed, showing that obedience leads to blessings. In chapter 9, the Gibeonites deceive Joshua into making a peace treaty by pretending to be travelers from afar. Joshua fails to consult God and is tricked, leading to the Gibeonites being cursed and made Israel’s servants. These chapters highlight the importance of seeking God’s guidance before acting and staying vigilant against deception.