After the 1865 crackdown in Ireland, the American organization began to fracture over what to do next. Made up of veterans of the American Civil War, a Fenian army had been formed. While O'Mahony and his supporters wanted to remain focused on supporting rebellions in Ireland a competing faction, called the Roberts, or senate wing, wanted this Fenian Army to attack British bases in Canada. The resulting Fenian Raids strained US–British relations. The level of American support for the Fenian cause began to diminish as the Fenians were seen as a threat to stability in the region.