Federal troops capture Gainesville, Florida.
The Confederate submarine H.L. Hunley makes its first and only successful run on a Federal ship in Charleston Harbor. The craft’s spar torpedo makes contact with the sloop USS Housatonic and is detonated, sinking the Housatonic. However, the Hunley does not return from its mission. Five men on the Housatonic and the entire seven-man crew of the H.L. Hunley are killed. It is the first time a ship is sunk by a submarine.
Federals who have tunneled under the Confederate lines east of Petersburg, Virginia (35 km south of Richmond), plant powder and blow a hole 50 meters long, 20 meters wide and ten meters deep, killing 278 southerners in the process. The hopelessly bungled attempt by the northerners to exploit the breach is called the “Battle of the Crater.” The day leaves 5,200 total casualties.
Confederate terrorists slip over the border from Canada and rob three banks in St. Alban’s, Vermont of $200,000. Citizens prevent them from burning the town. Eleven attackers escape into Canada.