1 Samuel 19:8

And there was war again: and David went out, and fought with the Philistines, and slew them with a great slaughter; and they fled from him.

Cross-reference

Psalm 18:32-50 is David's song of thanksgiving for God's strength in battle, reflecting on victories like this one.

Psalm 27:3 expresses David's confidence despite armies — the same trust he shows when fighting Philistines here.