Canadians are taught to remember the War of 1812 as the defining moment when our territory was threatened from the south. Far less well known is a second, very real challenge to Canada's security that unfolded only decades later-after Confederation-when Irish-American militants launched a series of cross-border raids in an attempt to pressure Britain into granting independence to Ireland.

Between 1866 and 1871, members of the Fenian movement-many of them veterans of the American Civil War-believed they could seize Canadian towns, transportation routes, and strategic sites, and use occupied Canadian territory as leverage against the British government. While the raids ultimately failed, the threat they posed was taken seriously by Canada's newly formed federal government and by communities along the border, particularly in eastern Ontario.

Drawing on local reactions, government responses in Ottawa, and the experiences of small towns and rural settlements suddenly placed on the front line, Phil Gurski explores how the Fenian threat exposed the vulnerabilities of a young country and helped shape Canada's early approach to defence, security, and sovereignty. By examining how Canadians understood-and responded to-this unconventional and politically motivated campaign, this book reveals a largely forgotten episode that contributed to the development of Canadian nationalism and the foundations of Canada's modern national security system.