7 while the army of the king of Babylon was fighting against Jerusalem and the other cities of Judah that were still holding out—Lachish and Azekah. These were the only fortified cities left in Judah.

Read Jeremiah 34:7 Using Other Translations

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.
when the army of the king of Babylon was fighting against Jerusalem and against all the cities of Judah that were left, Lachish and Azekah, for these were the only fortified cities of Judah that remained.
At this time the Babylonian army was besieging Jerusalem, Lachish, and Azekah—the only fortified cities of Judah not yet captured.