On September 28, 1938, the two teams met for the second game of the series, where Hartnett experienced the highlight of his career. With darkness descending on the lightless Wrigley Field and the score tied at 5 runs apiece, the umpires ruled that the ninth inning would be the last to be played. The entire game would have to be replayed the following day if the score remained tied. Hartnett came to bat with two out in the bottom of the ninth inning. With a count of 0 balls and 2 strikes, Hartnett connected on a Mace Brown pitch, launching the ball into the darkness, before it eventually landed in the left-center field bleachers. The stadium erupted into pandemonium as players and fans stormed the field to escort Hartnett around the bases. Hartnett's walk-off home run became immortalized as the "Homer in the Gloamin"'.