Birthdays
William Daily Clayton
Turns 28 on this date
Jonathan Perry Harrison
Turns 37 on this date
Anthony Kennedy
Turns 56 on this date
Samuel Alexander Mudd
Turns 33 on this date
Robert Barnwell Rhett
Turns 66 on this date
James Sewall Thomas
Turns 35 on this date
Events
| Battles/Soldiers | Sioux and Cheyenne warriors wipe out 81 U.S. Army soldiers near Fort Phil Kearny in Wyoming. | 12/21/1866 |
| Legal/Political | The second session of the 39th Congress is in a two-week holiday recess until January 4, 1867 |
12/20/1866 to 01/02/1867 |