The Irish-American invasion of Canada in the second half of the 1860s was a failure, and the Battle of Ridgeway in June, 1866 did not result in high casualties. It did result in the only major victory for the Fenians. I recently found this Ph.D. dissertation on this battle and thought some may find in interesting. Peter Vronsky wrote a history of the Battle of Ridgeway in a book title Ridgeway: The American Fenian Invasion And The 1866 Battle That Made Canada
, but it is difficult to obtain a copy and is usually expensive. Vronsky wrote his Ph.D. dissertation titled Combat, Memory and Remembrance in Confederation Era Canada: the hidden history of the Battle of Ridgeway, June 2, 1866
and I assume it was the basis of his book. For anyone interested here it is.