David strikes the Philistines
When David was a commander of troops under Saul, he fought successfully against the Philistines.
Key passages
1 Sa 18:30

Then the commanders of the Philistines went out for battle, and as often as they went out, David succeeded more than all the servants of Saul, and his name became very esteemed.

1 Sa 19:8

War came again, so David went out and fought against the Philistines and defeated them thoroughly so that they fled before him.

See also