I can think of a few:
Numbers 31:7 They fought against Midian, as the LORD commanded Moses, and killed every man.
Numbers 31:17 Now kill all the boys. And kill every woman who has slept with a man,
Joshua 8:24 When Israel had finished killing all the men of Ai in the fields and in the desert where they had chased them, and when every one of them had been put to the sword, all the Israelites returned to Ai and killed those who were in it.
Judges 21:11 "This is what you are to do," they said. "Kill every male and every woman who is not a virgin."