In the years following the Great War, Canadian military planners faced a sobering, hypothetical dilemma: a global conflict between the British Empire and the United States. Should such a war break out, Canada—as a key part of the Empire—would inevitably be dragged into the front lines. Realising that Canada could not survive a defensive war of attrition against its southern neighbour, Col. James "Buster" Sutherland Brown drafted a radical contingency plan in 1921.

He argued that the best defence was a good offence. Instead of waiting to be overwhelmed, Canada would launch a series of surprise, lightning-fast "Flying Columns" into the Northern States. The goal was to cause immediate chaos, buy time for the British Royal Navy to cross the Atlantic, and secure the St. Lawrence River.

The Five "Flying Columns"

The strategy relied on high-speed, mobile units striking deep into American territory to seize strategic hubs:

Pacific Column (BC): Targeted Seattle, Spokane, and Portland to occupy the West Coast and block an American counter-push through the mountains.

Prairie Column (MB/SK): A thrust into Fargo and Minneapolis designed to sever the vital transcontinental rail lines, crippling US logistics.

Great Lakes Column (ON): Aimed to capture Detroit and the Sault Ste. Marie Canals to neutralise the American industrial heartland and control shipping lanes.

Quebec Column (QC): A surprise offensive into Albany and New York City to disrupt the US Eastern Command centre.

Maritime Column (NB/NS): A strategic push into Maine to create a land buffer to protect Atlantic supply routes.

Intelligence & "Buster" Brown’s Reconnaissance

This was no mere paper exercise. Col. James "Buster" Sutherland Brown personally conducted clandestine reconnaissance missions across the border. Driving a civilian Model T, Brown mapped out bridges, photographed telegraph stations, and interviewed local Americans to gauge their "affability" toward a Canadian presence. His meticulous notes provided the tactical backbone for the invasion routes, identifying which pieces of infrastructure to destroy during a planned tactical retreat to keep the US military bogged down.

The US Response: War Plan Red

The Americans were prepared for this hypothetical struggle as well. Their counterpart, "War Plan Red," was a brutal strategy for the total occupation of Canada. Unlike the Canadian plan, which focused on delay and sabotage, the American plan authorized the use of chemical weapons (poison gas) against the city of Halifax to ensure the British Royal Navy could never land reinforcements.

Defence Scheme No. 1 remained official Canadian policy until 1931, standing today as a testament to a time when Canada was prepared to act with incredible audacity to ensure its sovereignty.