In southern Ontario, Fenian invaders push back Canadian militia at the Battle of Ridgway
Intending to force British concessions in Ireland, Fenian infantry under Union Army veteran Colonel John O'Neill had crossed the Niagara River and arrived the day before at Fort Erie in present-day Ontario and hoisted the Fenian flag. Fenians and Canadian militia met near the town of Ridgeway and the Irish, many Civil War veterans pushed back the Canadians in a confusing battle that resulted in light losses on both sides. (By John Osborne).
Patrick Steward, Bryan P. McGovern, The Fenians: Irish Rebellion in the North Atlantic World, 1858–1876 (Knoxville, TN: University of Tennessee Press, 2013), 126-129.