The Great Hanging at Gainesville

Hanging of Union Men in Texas. Frank Leslie's Ilustrated Newspaper.
Prints and Photographs Collection 1993/202-5-4. 

Another fascinating post from the New York Times's Disunion blog (October 16, 2012). . .

On Oct. 12, a cold Sunday morning in Gainesville, the mob had enough of the deliberations inside and stormed the courtroom, demanding a list of the men on trial; the jury complied and handed over the names of 14 of them, chosen at random; all were hanged the next day, under the supervision of Young (coincidentally, three days later he was killed by bandits preying along the Red River).