The writer explained the military disaster that resulted from Saul's disobedience in verses 16-18. Saul's army dwindled and the enemy continued to move around his capital city freely.
Saul evidently led his troops from Gilgal to Geba where some of the Israelite soldiers camped. Saul himself proceeded back to Gibeah (14:2). The Philistines had posted a larger camp of their soldiers just north of the Wadi Suweinit ravine from Geba near Michmash. The Philistines used their camp (garrison, v. 23) at Michmash as a base for raiding parties. >From Michmash these raiders went north toward Ophrah, west toward Beth-horon, and probably southeast toward the wilderness, specifically the valley of Zeboim (exact site unknown).
The main physical advantage the Philistines enjoyed was their ability to smelt iron. This advanced technology gave them a strong military edge over the Israelites.142As in the days of Deborah and Barak (Judg. 5:8), the Philistines still had the advantage of superior weapons and the power to restrict the Israelites' use of iron implements.