Birthdays
Samuel Cushman Caldwell
Turns 30 on this date
David McMurtrie Gregg
Turns 33 on this date
Charles Murray Harris
Turns 45 on this date
Benjamin Franklin Kelley
Turns 59 on this date
Thomas Overton Moore
Turns 62 on this date
Events
| Battles/Soldiers | A New Hampshire monument is dedicated at the new Winchester National Cemetery in Virginia, | 04/10/1866 |
| Lawmaking/Litigating | In Columbus, Ohio, Lambdin P. Milligan walks free after almost two years in prison | 04/10/1866 |
| Lawmaking/Litigating | The American Society for the Prevention of Cruelty to Animals is chartered in the New York Legislature | 04/10/1866 |
| Legal/Political | The first session of the 39th Congress is sitting in Washington DC from early January to late July, 1866 |
01/07/1866 to 07/27/1866 |