'Eleventh' in the Bible

It came also in the days of Jehoiakim the son of Josiah, king of Judah, until the end of the eleventh year of Zedekiah the son of Josiah, king of Judah, until the exile of Jerusalem in the fifth month.

in the eleventh year of Zedekiah, in the fourth month, in the ninth day of the month, the city wall was breached.

So the city was under siege until the eleventh year of King Zedekiah.