When the Philistines heard that the children of Israel were gathered together at Mizpah, the lords of the Philistines went up against Israel. When the children of Israel heard it, they were afraid of the Philistines.
After the tabernacle left Shiloh, the Israelites may have pitched it at Mizpah. Since Samuel offered a burnt offering there (1 Samuel 7:9), perhaps that is where the tabernacle stood. Nevertheless at this time the Israelites made offerings to God at other places too (cf. 1 Samuel 7:17).