פּירוש אויף תהילים 83:9

Also Assyria Even Assyria, which until that day was careful of other foolish counsels and would not join evildoers, as it says (Gen. 10:11): “From that land Asshur went forth,” that he left the counsel of the generation of dispersion [which built the tower], joined them here and assisted them for evil. (In other commentaries I found this:) Also Assyria joined them, etc. Also this one, who initially loved good deeds—for he separated from Nimrod’s counsel, as it is said: “From that land Asshur went forth”—he too reverted to wickedness. Therefore, he participated in destroying Your temple. Genesis Rabbah 37:4.

they were the arm All these gave strength and aid to Moab and Ammon, our neighbors, to come upon us.