Jeremiah 39:3 - Matthew Poole's English Annotations on the Holy Bible

All the great men of Babylon that were employed in the conduct of the Babylonian army (the city being taken by storm or surprise) entered into it, but rested at the middle gate. The city, they say, was encompassed with two walls, before they came to the wall of the temple; the gate in the inner wall is supposed to have been that which is called the middle gate: they would not at first adventure in further; the city being large and well fortified, there might have been some traps laid for them; they would therefore have their soldiers first clear the streets, and search all places, that they might enter further into the city without hazarding their persons. Some interpreters have examined the signification of the names of these princes, but I know of no use it can be to us, whether they were the names of the persons, or significative of the offices they bare.