Behold, I will make you a new sharp threshing instrument having teeth: you shall thresh the mountains, and beat them small, and shall make the hills like chaff.
Read Chapter 41
George Leo Haydock
Chaff. Cambyses perished on the mountains of Judea, (Haydock) and the Machabees gained many victories over the Syrians, Micheas iv. 13., and Ezechiel xxxix. (Calmet)
They are here meant, as their exploits resembled those of Cyrus. (Houbigant)