Jonathan struck the garrison of the Philistines that was in Geba: and the Philistines heard of it. Saul blew the trumpet throughout all the land, saying, Let the Hebrews hear.
So Jonathan was out wiping out the Philistines and Saul was around blowing the trumpet, and taking the glory and announcing that he had smitten the Philistines so that the Israelites heard that Saul had smitten the Philistines with a great slaughter.