Black Kettle went to Fort Lyon.

He reported to the military commander as agreed.

He was told by the Fort Lyon commander, Major Edward Wynkoop, that his band could camp at Sand Creek, about forty miles from the fort, where they would be under military protection.

They moved to Sand Creek.

They believed they were safe.

Sand Creek: November 29, 1864

The attack at Sand Creek has been examined in extraordinary detail by historians, congressional investigations, and military tribunals.

The basic facts are not disputed, even though interpretations of those facts were contested from the beginning.