Here is one example from the tenth chapter of the Book of Joshua:

And Joshua returned, and all Israel with him, to Debir; and
fought against it:

And he took it, and the king thereof; and all the cities
thereof; and they smote them with the edge of the sword,
and utterly destroyed all the souls that were therein; he
left none remaining: as he had done to Hebron, so he did
to Debir, and to the king thereof; as he had done also to
Libnah, and to her king.

So Joshua smote all the country of the hills, and of the south,
and of the vale, and of the springs, and all their kings: he
left none remaining, but utterly destroyed all that breathed,
as the Lord God of Israel commanded.

And Joshua smote them from Kadesh-barnea even unto Gaza, and
all the country of Goshen, even unto Gibeon.

Elijah the prophet was of the same uncompromising kind. After he
had mocked the god Baal, and had triumphed over him by miracle, he
said to the Israelites:

"Take the prophets of Baal. _Let not one of them escape._"
And they took them, and Elijah brought them down to the brook
Kishon, and slew them there.

Now, there were 450 of the priests of Baal, all of whom Elijah the
prophet had killed in cold blood.