U.S. Army hangs four Modoc leaders for the murder of a Civil War general

On October 3, 1873, Captain Jack and his companions were hanged for their part in the Modoc War and the murder of Gen Canby. From the article:

"U.S. Army hangs four Modoc leaders for the murder of a Civil War general
On October 3, 1873, the United States military hangs four Native Americans found guilty of murdering the Civil War general Edward Canby during the Modoc War in Oregon. Canby was the highest ranking military official–and the only general–ever killed by Native Americans.

As with most of the American military conflicts with Natives, the Modoc war began with a struggle over land. A treaty signed in 1864 had forced a band of Modoc people under the leadership of Chief Keintpoos—known to Americans as Captain Jack—to move to a reservation in southeastern Oregon dominated by Klamath people,, who viewed the Modoc as unwelcome intruders on their traditional lands. Frustrated with the ill–treatment they received at the hands of the Klamath, Captain Jack and his followers abandoned the reservation in 1870 and returned to their former territory and traditional hunter-gatherer life.

But during their six-year absence, white settlers had flooded into the Modocs' former territory. Despite Captain Jack’s repeated assurances that his people wanted only peace, many feared the Natives. In 1872, bowing to public pressure, the U.S. dispatched military forces to remove the Modoc and force them back onto the reservation. When some of the more hotheaded Modoc resisted, war broke out; and the Modoc fled to a stronghold among the Lava Beds south of Tule Lake, where they succeeded in holding off U.S. forces for almost half a year.

During the early months of the Modoc War, Captain Jack had strongly opposed armed resistance and continuously searched for a peaceful solution. But under pressure from more aggressive Modoc who were challenging his leadership, he made the fatal error of agreeing to a plan to kill the leader of the American forces, General Edward Canby. On April 11, 1873, Canby and two other men entered the Modoc stronghold under a flag of truce, hoping to negotiate a peaceful end to the conflict. Captain Jack murdered Canby, and other Modoc killed one of his companions. The third man escaped to give a detailed report of the Modocs' treachery.

Outraged by the murder of an honored Civil War general, Americans demanded swift retribution. The Army stepped up its attacks on the Modoc, and by early June Captain Jack and his followers had been captured. After a military trial at Fort Klamath, Oregon, Captain Jack and three other Modoc leaders were found guilty of murder and hanged. As a result of the Modoc War and the murder of Canby, the U.S. began to take a much more aggressive approach to dealing with Native American problems throughout the nation."