Ambrose of Milan, on Num 31:1

“And the Lord spoke to Moses, saying:”

“But a deeper vengeance is taken on fiercer foes and on those that are false as well as on those who have done greater wrongs, as was the case with the Midianites. For they had made many of the Jewish people to sin through their women. For this reason the anger of the Lord was poured out upon the people of our fathers. Thus it came about that Moses when victorious allowed none of them to live.”

Imported from an open dataset — not yet checked against the printed edition.