Question

in 1886, the Sioux Chief Red Cloud abused and massacred Union Soldiers in an incident that would be referred to as

Answer 1

The year should be 1866 not 1886.

In 1866, the Sioux Chief Red Cloud ambushed and massacred Union Soldiers in an incident that would be referred to as THE FETTERMAN MASSACRE or BATTLE OF THE HUNDRED SLAIN.

The Fetterman Massacre was a battle during Red Cloud's war on 21st December  1866. The battle was between the Lakota, Cheyenne, and Arapaho Indians and the United States Army soldiers led by Colonel William Fetterman.

The ploy of leading the US Army to an Indian ambush was the idea of Crazy Horse, a fellow Indian leader of Red Cloud.