1 Samuel 13:3-4

3Soon after this, Jonathan attacked and defeated the garrison of Philistines at Geba. The news spread quickly among the Philistines. So Saul blew the ram’s horn throughout the land, saying, “Hebrews, hear this! Rise up in revolt!”

4All Israel heard the news that Saul had destroyed the Philistine garrison at Geba and that the Philistines now hated the Israelites more than ever. So the entire Israelite army was summoned to join Saul at Gilgal.