Now as Samuel was offering up the burnt offering, the Philistines drew near to battle against Israel. But the LORD thundered with a loud thunder upon the Philistines that day, and so confused them that they were overcome before Israel.
1 Samuel 7:10
Surrounding context
7:9 And Samuel took a suckling lamb and offered it as a whole burnt offering to the LORD. Then Samuel cried out to the LORD for Israel, and the LORD answered him.
7:10 Now as Samuel was offering up the burnt offering, the Philistines drew near to battle against Israel. But the LORD thundered with a loud thunder upon the Philistines that day, and so confused them that they were overcome before Israel.
7:11 And the men of Israel went out of Mizpah and pursued the Philistines, and drove them back as far as below Beth Car.