C. F. Keil and Franz Delitzsch on 2 Samuel 17:13

2Sa 17:13 “And if he draw back into a city, all Israel lays ropes to that city, and we drag it to the brook, till there is not even a little stone found there.” עד־הנּחל: inasmuch as fortified cities were generally built upon mountains. צרור signifies a little stone, according to the ancient versions. Hushai speaks in hyperboles of the irresistible power which the whole nation would put forth when summoned together for battle, in order to make his advice appear the more plausible.