By the gate betwixt the two walls— That is, betwixt the wall and the outworks, or betwixt the old wall of the city and the new one which was built by Hezekiah. See 2 Chronicles 32:5 and Ezekiel 12:4; Ezekiel 12:28.
Related Commentaries of Jeremiah 39:4
Jeremiah 39:4
4 And it came to pass, that when Zedekiah the king of Judah saw them, and all the men of war, then they fled, and went forth out of the city by night, by the way of the king's garden, by the gate betwixt the two walls: and he went out the way of the plain.