What does Jeremiah 39:3 mean?

All the Babylonian officials came in and sat at the Middle Gate: Nergal-sharezer of Samgar, Nebo-sarsekim the chief officer, Nergal-sharezer the high official, and all the other officials of Babylon’s king. Jeremiah 39:3 - Modern Text Bible

(Babylon’s top leaders take control of the city, establishing their authority.)