On 29 November, Cheyenne and Arapaho Indians were massacred at Sand Creek. U.S. cavalry troops attacked the Indians as they awaited surrender terms.
Citation:
Richert, Lucas Paul. "Sand Creek Massacre".
The Literary Encyclopedia. First published 01 February 2009
[http://www.litencyc.com/php/stopics.php?rec=true&UID=5967, accessed 19 June 2013.]