NET

7 He did this while the army of the king of Babylon was attacking Jerusalem and the cities of Lachish and Azekah. He was attacking these cities because they were the only fortified cities of Judah that were still holding out.

Darby

7 And the king of Babylon's army fought against Jerusalem, and against all the cities of Judah that were left, against Lachish, and against Azekah; for these were amongst the cities of Judah, the fenced cities that were left.

KJV

7 When the king of Babylon's army fought against Jerusalem, and against all the cities of Judah that were left, against Lachish, and against Azekah: for these defenced cities remained of the cities of Judah.