On this day: July 1

Published On: Jun 28 2013 03:06:05 PM CDT   Updated On: Jul 01 2016 01:00:00 AM CDT

The Battle of Gettysburg begins, America's first zoo opens, the first Tour de France starts, the Sony Walkman hits the market, the PG-13 movie rating is introduced, and the Deepwater Horizon oil spill breaks an unfortunate record, all on this day.

OTD July 1 - Hank Greenberg
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Library of Congress

1945: After being away from the game for four years while serving in the U.S. Army during World War II, Hank Greenberg homers in his first game back with the Detroit Tigers. Greenberg was one of the first MLB stars to return to playing after the war.

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