So in the ninth1 year of Zedekiah's reign, on the tenth day of the tenth month, Nebuchadnezzar2 king of Babylon marched against Jerusalem with his whole army. He encamped outside the city and built siege works3 all around it.
References for 2 Kings 25:1
The city was kept under siege until the eleventh year of King Zedekiah.
By the ninth day of the [fourth] month the famine4 in the city had become so severe that there was no food for the people to eat.
References for 2 Kings 25:3