What is "the day of Midian"?

I am trying to find out the meaning of the reference “as on the day of Midian” at the end of the 1/23 reading. No help on the internet and our parish priest said he didn’t know. Thanks. God bless Catholic Answers.

"The day of Midian” in this reading refers to Israel’s triumph over Midian as recorded in Judges 7-8.

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