John O'Neill arrested, ending the Fenian raids

Background. John Charles O'Neill was an Irish-born officer in the American Civil War who joined the Fenian Brotherhood in Tennessee. The Brotherhood was an Irish republican organization based in the United States that sought to end British rule in Ireland through militant action rather than politics. O'Neill became a prominent leader, appointed inspector general and later president, leading raids in 1866 and 1870. These activities were part of a broader series of incursions into Canada, though none achieved their political aims.

The 1871 Raid. Following the failed 1870 invasion and his resignation from the Senate Wing, O'Neill joined the Savage Wing. In 1871, lacking the backing of the majority of Fenians, he led an attack on the Hudson's Bay Company's post at Pembina, Dakota Territory, on 5 October 1871. This raid was part of the Fenian Brotherhood's continued efforts to conduct incursions into Canadian provinces, including Manitoba, during the period from 1870 to 1871.

Arrest and Legacy. The arrest of John O'Neill by US authorities in October 1871 ended the Fenian raids. Although the raids did not advance Irish independence, the 1866 incursions and the Canadian Militia's response helped galvanize support for Confederation in 1867. US authorities had previously arrested Fenian men and confiscated arms, with some speculation that government officials ignored preparations due to anger over British assistance to the Confederacy.