Just over a year after Robert E. Lee relinquished his sword, a band of Union and Confederate veterans dusted off their guns. But these former foes had no intention of reigniting the Civil War. Instead, they fought to undertake one of the most fantastical missions in military history: to seize the British province of Canada and hold it hostage until the independence of Ireland was secured. What follows is the untold tale of patriotic Irish Americans and their chapter in Ireland's fight for independence.