So it came to pass in the day of battle, that there was neither sword nor spear found in the hand of any of the people that were with Saul and Jonathan: but with Saul and with Jonathan his son was there found. 1 Samuel 13:22But God had a plan. He'd force the Philistines to kill each other (and throw in an earthquake for dramatic effect).
And there was trembling ... and the earth quaked: so it was a very great trembling. ...After the Philistines killed each other, the Israelites must have gathered up their swords and spears, because by the end of the same chapter Saul is fighting everybody at once, "vexing" them all.
The multitude melted away, and they went on beating down one another... Every man's sword was against his fellow. 1 Samuel 14:15-20
So Saul ... fought against all his enemies on every side, against Moab, and against the children of Ammon, and against Edom, and against the kings of Zobah, and against the Philistines: and whithersoever he turned himself, he vexed them. And he gathered an host, and smote the Amalekites, and delivered Israel out of the hands of them that spoiled them. 1 Samuel 14:47-48(Since the Bible doesn't say that God was involved in these battles, I didn't include the victims in God's total.)
How many Philistine soldiers did God kill by forcing them to kill each other? The Bible doesn't say, so I just guessed the usual 1000.
God's next killing: The Amalekite Genocide