Micmash Campaign - Saul began his campaign against the Philistines at Micmash.  But his son, Jonathan, ended up being a key figure in the battle.

"Now Saul chose for himself 3,000 men of Israel, of which 2,000 were with Saul in Micmash and the hill country of Bethel, while 1,000 were with Jonathan at Gibeah of Benjamin.  But he sent away the rest of the people, each to his tent.  Jonathan smote the garrison of the Philistines that was in Geba, and the Philistines heard of it.  Then Saul blew the trumpet throughout the land, saying, 'Let the Hebrews hear.'  All Israel heard that Saul had smitten the garrison of the Philistines, and also that Israel had become odious to the Philistines.  The people were then summoned to Saul at Gilgal...So the Lord delivered Israel that day, and the battle spread beyond Beth-aven." (I Samuel 13:1-4 & 14:23, NASB)