Babylon had the extent rather of a nation than of a city. Therefore grain was grown within the city wall sufficient to last for a long siege [Aristotle, Politics, 3.2; Pliny, 18.17]. Conquerors usually spare agriculturists, but in this case all alike were to be “cut off.”
for fear of ... oppressing sword - because of the sword of the oppressor.
every one to his people - from which they had been removed to Babylon from all quarters by the Chaldean conquerors (Jer 51:9; Isa 13:14).