What does 2 Chronicles 18:10 mean?

Zedekiah son of Kenaanah had made some iron horns and said, 'This is what the Lord says: With these you’ll gore the Arameans until they’re wiped out.' 2 Chronicles 18:10 - Modern Text Bible

(One prophet, Zedekiah, used a dramatic prop to predict victory, claiming it was God’s message.)