Jeremiah 39:3

Sat in the middle gate - The city of Jerusalem stood upon two hills, Sion to the south, and Acra to the north, with a deep valley between them. The gate of the center, as the term seems plainly to import, was a gate of communication in the middle of the valley, between the two parts of the city, sometimes called the higher and the lower city. The Chaldeans entered the city on the north side by a breach in the walls, and rushing forward and posting themselves in this gate, in the very heart or center of the city, became thereby masters at will of the whole. Zedekiah with his troop, perceiving this, fled out of the opposite gate on the south side. See Blayney. This is likely; but we know nothing positively on this subject.

Nergal-sharezer - These were the principal commanders; but Dr. Blayney thinks that instead of six persons, we have in reality but three, as the name that follows each is a title of office. Thus, Nergal-sharezer, who was Samgar; Nebusarsechim, who was Rab-saris; and Nergal-sharezer, who was Rab-mag. As Nergal-sharezer occurs twice here, and we know that Nebuzaradan was general-in-chief, the first Nergal-sharezer is probably a mistake for Nebuzar-adan, or some other of the commanders. But these things are as uncertain as they are unimportant.