Confederate Army of Manhattan
The Confederate Army of Manhattan was a group of eight Southern operatives who attempted to burn New York City on or after Evacuation Day, November 25, 1864, during the final stages of the American Civil War. In a plot orchestrated by Jacob Thompson, the operatives infiltrated Union territory by way of Canada and made their way to New York City.
Source: Wikipedia — Confederate Army of Manhattan (CC BY-SA 4.0)