Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[199] When Amaziah had read this letter, he was more eager upon this expedition, which, I suppose, was by the impulse of God, that he might be punished for his offense against him. But as soon as he led out his army against Joash, and they were going to join battle with him, there came such a fear and consternation upon the army of Amaziah, as God, when he is displeased, sends upon men, and discomfited them, even before they came to a close fight. Now it happened, that as they were scattered about by the terror that was upon them, Amaziah was left alone, and was taken prisoner by the enemy; whereupon Joash threatened to kill him, unless he would persuade the people of Jerusalem to open their gates to him, and receive him and his army into the city. Accordingly Amaziah was so distressed, and in such fear of his life, that he made his enemy to be received into the city. So Joash over threw a part of the wall, of the length of four hundred cubits, and drove his chariot through the breach into Jerusalem, and led Amaziah captive along with him; by which means he became master of Jerusalem, and took away the treasures of God, and carried off all the gold and silver that was in the king's palace, and then freed the king from captivity, and returned to Samaria. Now these things happened to the people of Jerusalem in the fourteenth year of the reign of Amaziah, who after this had a conspiracy made against him by his friends, and fled to the city Lachish, and was there slain by the conspirators, who sent men thither to kill him. So they took up his dead body, and carried it to Jerusalem, and made a royal funeral for him. This was the end of the life of Amaziah, because of his innovations in religion, and his contempt of God, when he had lived fifty-four years, and had reigned twenty-nine. He was succeeded by his son, whose name was Uzziah.