What remarkable feat did 17-year-old Jackie Mitchell accomplish on April 2, 1931?

Instead, I discovered the astounding story of Jackie Mitchell, a 17-year-old southpaw who pitched against the New York Yankees on April 2, 1931. The first batter she faced was Ruth, followed by Lou Gehrig, the deadliest hitting duo in baseball history. Mitchell struck them both out. There was a box score to prove it and news stories proclaiming her “organized baseball’s first girl pitcher.”