What does Judges 3:13 mean?

Eglon pulled together the people of Ammon and Amalek, and they went out and defeated Israel. Then they took over Jericho, the city known for its palm trees. Judges 3:13 - Modern Text Bible

(Eglon, the Moabite king, forms an alliance and conquers a key city in Israel, showing Israel's vulnerability after turning away from God.)