63.

The Lord thundered great thunder upon the Philistines

After God killed more than 50,000 for looking into the ark, the ark was moved to Kirjathjearim and the people of Israel "lamented after the Lord" -- which means, I guess, that they wanted the damned thing back.

And it came to pass, while the ark abode in Kirjathjearim, that the time was long; for it was twenty years: and all the house of Israel lamented after the LORD. 1 Samuel 7:2

So Samuel told them what to do. Get rid of all their other gods and worship Yahweh alone. So the Israelites rounded up all their gods and threw them away. Then Samuel told all the people of Israel to gather at Mizpeh and he would say a little prayer for them.

Samuel said, Gather all Israel to Mizpeh, and I will pray for you unto the LORD. 7:5

So everyone in Israel came to Mizpeh and poured water out for the Lord, fasted, and said they'd sinned.

And they gathered together to Mizpeh, and drew water, and poured it out before the LORD, and fasted on that day, and said there, We have sinned against the LORD. 7:6

When the Philistines heard about all this, they prepared to attack Israel.

When the Philistines heard that the children of Israel were gathered together to Mizpeh, the lords of the Philistines went up against Israel. 7:7a

The Israelites were afraid of the Philistines, so they asked Samuel to ask God to save them.

When the children of Israel heard it, they were afraid of the Philistines. 7:7b

So Samuel killed a baby lamb and burned its dead body for God.

Samuel took a sucking lamb, and offered it for a burnt offering wholly unto the LORD. 7:9a

Then Samuel cried out to God and God heard him.

And Samuel cried unto the LORD for Israel; and the LORD heard him. 7.9b

While Samuel was busy roasting the lamb for God, the Philistines attacked. And God "thundered with a great thunder" and "discomfited them." Then the Israelites chased them down and killed them.

As Samuel was offering up the burnt offering, the Philistines drew near to battle against Israel: but the LORD thundered with a great thunder on that day upon the Philistines, and discomfited them; and they were smitten before Israel. And the men of Israel went out of Mizpeh, and pursued the Philistines, and smote them. 7:10-11

After the slaughter, Samuel put up a monument that said, "So far the Lord has helped us."

Then Samuel took a stone ... saying, Hitherto hath the LORD helped us. 7:12

Once again the Bible doesn't say how many Philistines were killed. So I'll just call it 1000.