What does Deuteronomy 20:1 mean?

When you head out to fight your enemies and you see their horses, chariots, and armies that are way bigger than yours, don’t get scared. Remember, the Lord your God is with you—he’s the one who brought you out of Egypt. Deuteronomy 20:1 - Modern Text Bible

(This verse encourages the people not to be intimidated by overwhelming odds, reminding them that God, who rescued them from slavery, is still with them in battle.)