After the bosses from Philistia heard that the Israel mob came together at Mizpah, they took their soldiers to that place. The Israel mob heard they were coming, and they got frightened.
Saul and the Israel mob heard that big man’s words, and they got frightened and confused. (We have not yet translated 17:12-14. Those verses say that 3 of David’s big brothers were in that Israel soldier mob with Saul.)