Saul chose him three thousand men of Israel, of which two thousand were with Saul in Michmash and in the Mount of Bethel, and one thousand were with Jonathan in Gibeah of Benjamin: and the rest of the people he sent every man to his tent.
Jonathan defeated the garrison of the Philistines at Geba  (1 Samuel 13:3).  This poses a problem for some who point out that the garrison of the Philistines was actually at Gibeah  (1 Samuel 10:2); but there is no problem at all.  The Philistines had garrisons at both places and in all probability at a number of other places also.