Joshua 12:19 lists the defeated kings under Moses' leadership, specifically King of Madon, King of Hazor, King of Shimron-meron, and the King of Achshaph. This verse highlights the fulfillment of God's promise to give the land of Canaan to the Israelites by recounting the victories they achieved. It serves as a historical record of the conquest of Canaan, showcasing God's faithfulness in delivering the enemies into the hands of His people. The detailed account of the defeated kings demonstrates the precision and completeness of God's victory through the Israelites.