What does 1 Samuel 13:5 mean?

The Philistines gathered to fight Israel with three thousand chariots, six thousand horsemen, and troops as numerous as the sand on the seashore. They camped at Michmash, east of Beth-aven. 1 Samuel 13:5 - Modern Text Bible

(The Philistines respond with overwhelming military force, showing the seriousness of the threat Israel faces.)