Took Amaziah. In ancient times wars were fought with great vigor, and kings and commanders were often found in the forefront of the lines of battle with their troops. Ahab of Israel and Josiah of Judah lost their lives in battle (1 Kings 22:34-37; 2 Kings 23:29), and the life of Jehoshaphat was seriously threatened (1 Kings 22:32, 33).
Gate of Ephraim. This was a large section of either the northern wall at the western end or the western wall at the northern end. The object of this destruction was evidently to leave the capital of Judah at the mercy of Israel. The loss of this portion of the wall was a great humiliation to the people of Judah.
Four hundred cubits. Over 600 ft.