What does the Bible say about God's presence in battle?

In Joshua 5:13-15, we see a pre-incarnate appearance of the Lord Jesus Christ as the commander of the Lord's army. When Joshua encounters this figure, he questions whether he is for Israel or their enemies. The response, 'Neither,' reveals that God's intentions transcend human divisions; He comes to fulfill His divine purpose. This interaction emphasizes that God is not merely a supporter of Israel's physical struggles but serves a higher purpose that involves judgment and sovereignty over all nations.