Joshua took all these kings and their land at one time because the Lord God of Israel fought for Israel. – Joshua 10:42
After Joshua had defeated the five Amorite kings who joined forces against Israel and Gibeon, he conquered seven more kings and their kingdom in just one campaign. Joshua gained victory and success because God was with them. If God was not with them, it would’ve been impossible for them to defeat all their enemies. This verse simply teaches us that we cannot have success and victory if God is not with us. Long term success and achievements are not possible without obedience to God. Obey God, and watch as you too begin racking up victories.