Albert Barnes Commentary 1 Samuel 13:3

"And Jonathan smote the garrison of the Philistines that was in Geba: and the Philistines heard of it. And Saul blew the trumpet throughout all the land, saying, Let the Hebrews hear." — 1 Samuel 13:3 (ASV)

This was the first act in the war of independence, and probably the first feat of arms of the young hero Jonathan.