Birthdays
Samuel Prigg Carroll
Turns 34 on this date
John Conness
Turns 45 on this date
Austin Augustus King
Turns 64 on this date
Charles Joseph Little
Turns 26 on this date
Augustus Emmett Maxwell
Turns 46 on this date
Abram Baldwin Olin
Turns 58 on this date
Events
| Crime/Disasters | A very early frost disrupts the grain harvest in much of the eastern United States. | 09/21/1866 |
| Battles/Soldiers | In Kansas, a new U.S. cavalry regiment, the Seventh, begins its formation at Fort Riley. | 09/21/1866 |
| Religion/Philosophy | The African Methodist Episcopal Zion Church meets in Harrisburg, Pennsylvania in a special session. |
09/20/1866 to 09/21/1866 |
| Battles/Soldiers | Two more African-American regiments, the soon to be famous Ninth and Tenth Cavalry, come into being | 09/21/1866 |