He stayed seven days, according to the set time that Samuel [had appointed]: but Samuel didn't come to Gilgal; and the people were scattered from him.
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.