David said to Achish, Therefore you shall know what your servant will do. Achish said to David, Therefore will I make you keeper of my head for ever.
Now Gilboa is up in the area just south of the Sea of Galilee. So the Philistines had really moved a long way against the Israelites. Gilboa is clear over-actually the one side of Gilboa goes down to the Jordan River. So the Philistines had really taken a lot of the territories at this point. Saul was being boxed in to just a very small area. There he was encamped in Gilboa.