In which year was the terrible 'Hartford Coal Mine Riot' in the U. S. town of Hartford, Arkansas?

The Hartford coal mine riot occurred on July 12, 1914, at Hartford, Arkansas.

In a productive region of a state with 100% of its coal miners represented by the United Mine Workers, one mine owner attempted to open a non-union shop.

In the resulting conflict, mines were sabotaged by flooding, and on July 17 a crowd of union miners and sympathizers destroyed the surface plant of the Prairie Creek coal mine #3 and murdered two non-union miners.

Bache, the non-union mine owner, declared his ten businesses bankrupt on July 25, 1914, resulting in a decisive victory for the union.

Litigation arising from the strike and riot reached the Supreme Court not once but twice, in 1922 as Mine Workers v. Coronado Coal Co., 259 U.S. 344 and in 1925 as Coronado Coal Co. v. Mine Workers, 268 U.S. 295.

The receivers of the mine owners had alleged restraint of trade against the union. Ultimately the parties settled out of court in 1927 for $27,500, reversing prior awards of more than $700,000. By that time, mine workers' unions in Arkansas had completely collapsed.