In the Citadel near the Jaffa Gate fragmentary remains of fortifications were found, which include a corner of a massive tower with remains at 8 meters. This appears to be part of a gate that belonged to the northern defense system of Hezekiah’s wall defending the western expansion. The Babylonian generals met at this gate in June of 586 BC. Jeremiah 39:3 calls this the “middle gate”:

Then all the officials of the king of Babylon came and sat in the middle gate: Nergal-sar-ezer, Sam-sekim the Rab-saris, Nergalsar-ezer the Rab-mag... - Jeremiah 39:3

The area outside this gate, which suffered a great fire around that time, was littered with Babylonian and Israelite arrowheads.