38.

Joshua utterly destroyed all that breathed as the Lord God commanded

The title pretty much says it all on this one. It's kind of boring reading though.

Joshua took Makkedah, and smote it with the edge of the sword, and the king thereof he utterly destroyed, them, and all the souls that were therein; he let none remain : and he did to the king of Makkedah as he did unto the king of Jericho. Joshua 10:28

The same thing happens in the same way seven times, all in about a dozen verses or so.

Then Joshua ... fought against Libnah: And the LORD delivered it also ... and he smote it with the edge of the sword, and all the souls that were therein; he let none remain. 10:29-30

The LORD delivered Lachish into the hand of Israel, which took it ... and smote it with the edge of the sword, and all the souls that were therein. 10:32

Then Horam king of Gezer came up to help Lachish; and Joshua smote him and his people, until he had left him none remaining. 10:33

Joshua passed unto Eglon ... and smote it with the edge of the sword, and all the souls that were therein he utterly destroyed that day. 10:34-35

Joshua went up ... unto Hebron; and they fought against it: And they took it, and smote it with the edge of the sword, and the king thereof, and all the cities thereof, and all the souls that were therein; he left none remaining. 10:36-37

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. 10:38-39

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. 10:40

And all these kings and their land did Joshua take at one time, because the LORD God of Israel fought for Israel. 10:42

So God delivered seven kingdoms and Joshua killed everyone in each kingdom "with the edge of the sword."

And you can't blame it all on Joshua, either. He was just following orders, destroying everything that breathed, "as the Lord God of Israel commanded."

(Estimated number of victims: 7000, 1000 from each of seven cities.)