Matthew Poole and continuators on Jeremiah 35:11

11 But it came to pass when Nebuchadrezzar king of Babylon, came up into the land , that we said, Come, and let us go to Jerusalem, for fear of the army of the Chaldeans, and for fear of the army of the Syrians; So we dwell at Jerusalem.

When the Chaldean Army came into the land, they saw there would be no quiet abode for them any where but in some fortified place. The Syrians joyned with the Chaldeans in this War, as we read 2 King. 24.2. This they tell the Prophet was the reason why they who never used to dwell in Cities, nor fixed Houses, came to dwell at Jerusalem, to prevent being destroyed by the forragers for these Armies.