'Broken up' in the Bible

In the eleventh year of Zedekiah, in the fourth month, the ninth of the month, the city was broken up.

And the city was broken up, and all the men of war fled and went forth out of the city by night by the way of the gate between the two walls, which was by the king's garden. (And the Chaldeans lay around the city all around.) And they went by the way of the plain.