What does 2 Kings 14:12 mean?

Jehoash, king of Israel, captured Amaziah, king of Judah, at Beth Shemesh. Then Jehoash went to Jerusalem and broke down about two hundred yards of the city wall, from the Ephraim Gate to the Corner Gate. 2 Kings 14:12 - Modern Text Bible

(Israel not only defeats Judah but humiliates them by capturing their king and damaging Jerusalem's defenses.)