'Outpost' in the Bible

And Jonathan smote the outpost of the Philistines that was in Geba, and the Philistines heard of it. And Saul blew the trumpet throughout the land, saying, Let the Hebrews hear.

All Israel heard this message, "Saul has attacked the Philistine outpost, and now Israel is repulsive to the Philistines!" So the people were summoned to join Saul at Gilgal.