On 29 November, Cheyenne and Arapaho Indians were massacred at Sand Creek. U.S. cavalry troops attacked the Indians as they awaited surrender terms.
Richert, Lucas Paul. "Sand Creek Massacre". The Literary Encyclopedia. First published 01 February 2009; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=5967, accessed 21 April 2015.]