How does the Book of Joshua emphasize God’s divine power to defeat his enemies?
The Lord achieved victory for Joshua and Israel by his authority and supernatural power. The expression that the Lord has “given the land,” or “handed the land,” is the same verb in Hebrew, and is repeated several times in the book of Joshua. The Lord is the one who has given the enemies into Joshua’s hand. He is the one who has given the land to Israel. This is repeated to assert that the Lord is almighty, the one who defeats the enemies… When the kings of the Amorites gathered against the men of Gibeon, and the men of Gibeon asked for Joshua’s help in facing these kings, we read in Joshua 10:11:
As they fled before Israel, while they were going down the ascent of Beth-horon, the Lord threw down large stones from heaven on them as far as Azekah, and they died. There were more who died because of the hailstones than the sons of Israel killed with the sword (Joshua 10:11).
The emphasis presented here is on the Lord’s authority. He revealed his authority through this event — he threw stones, hailstones, on the enemies, and more of them died due to the Lord’s direct interference than those who were killed by Israel’s swords… So, the victory here is absolutely a supernatural victory due to the direct interference of the Lord in the events. This teaches us a marvelous thing about our Almighty God who has the absolute power and authority over everything and all circumstances.