Victory comes by faith in God and obedience to His word, not military power or numerical superiority. Faithful obedience is the victory. This truth is communicated through the lives of the people you will meet in this book, such as Joshua, Caleb, Rahab, Achan, the Canaanites, the Gibeonites, the Anakim, Eleazer, and Phinehas.
The Israelities, led by Joshua, are victorious over their enemies against all odds. They conquer and divide the Promised Land which demonstrates the faithfulness of God toward His people by keeping His promises.