#OnThisDay 1866 Over 1,000 Fenians invade Canada led by Ex-Union officer John O’Neill. By invading Canada, the Fenians hope to force Britain to withdraw from Ireland. The raiding party were battle hardened Civil-War veterans from both the Union & Confederacy. They entered via Niagara into Ontario and while the US President Jackson, did not disagree with the plan, they were eventually cut off from their supply of men and munitions by US Navy on the river. This plan was hindered by Fenians in the navy who after 14 hours, let enough cross the border before they followed orders. This raid would be the most successful of all the Fenian raids over the next five years.