1917: Thirteen black soldiers of the 24th U.S. Infantry Regiment December 11th, 2008 Headsman On this date in 1917, thirteen black soldiers were secretly hanged at dawn at a military camp outside San Antonio for their parts in a Houston race riot four months earlier.

http://www.executedtoday.com/2008/12/11/1917-thirteen-black-soldiers-of-the-24th-us-infantry-regiment/