Canada's Role in World War One — What to Know for the Citizenship Test

# Canada's Role in World War One — What to Know for the Citizenship Test

World War One transformed Canada — politically, socially, and as a nation on the world stage. This guide covers the WWI facts the citizenship test expects you to know.

WWI began August 4, 1914, when Britain declared war on Germany after Germany invaded Belgium. As a member of the British Empire, Canada was automatically committed to the war by Britain's declaration. There was no separate Canadian Parliament vote to enter — Canadian foreign policy in 1914 was set by Britain.

However, Canada decided how to fight: Prime Minister Sir Robert Borden offered an initial expeditionary force of 25,000 men. Recruitment far exceeded that — by war's end, over 600,000 Canadians had enlisted out of a population of roughly 8 million.

The army Canada raised was called the Canadian Expeditionary Force (CEF). It grew to four divisions organised as the Canadian Corps, fighting on the Western Front in France and Belgium.

Commanders:

• General Sir Julian Byng (British) — commanded the Canadian Corps from May 1916 to June 1917
• General Sir Arthur Currie (Canadian) — commanded the Canadian Corps from June 1917 to war's end. The first Canadian to lead the Canadian Corps.

Second Battle of Ypres (April–May 1915)

The first time Canadians faced large-scale combat — and the first time German forces used poison gas (chlorine) on the Western Front. Canadians held the line despite heavy casualties (over 6,000 killed or wounded in 48 hours), earning early reputation as effective troops.

Battle of the Somme (July–November 1916)

Massive Allied offensive. Canadians fought in the later phases. Heavy casualties, limited gains. The first appearance of tanks in warfare.

Battle of Vimy Ridge (April 9–12, 1917)

The first time all four Canadian divisions fought together — a Canadian Corps victory after British and French failures. Considered a defining moment of Canadian nationhood. See [Why Is the Battle of Vimy Ridge Important to Canada?](/blog/battle-vimy-ridge-canada-significance).

Battle of Passchendaele (October–November 1917)

A horrific battle in mud and rain in Flanders. Canadians took the village of Passchendaele but at the cost of 16,000 casualties.

The Hundred Days (August 8–November 11, 1918)

The final Allied push. The Canadian Corps was the spearhead of the British Empire forces. In 100 days, Canadians captured 31,000 prisoners, 600 guns, and 200 km of ground — culminating in the German surrender on November 11.

• Royal Canadian Navy (founded 1910) was small but operated patrol vessels in the Atlantic
• Canadian airmen served in the British Royal Flying Corps and Royal Naval Air Service (no separate Canadian air force in WWI; the RCAF was formed in 1924). Canadian aces included Billy Bishop (72 confirmed victories) and Roy Brown (credited with shooting down the Red Baron).

WWI transformed Canadian society:

• Conscription crisis (1917) — when voluntary recruitment slowed, the Borden government introduced conscription. It deeply divided English and French Canada (Quebec largely opposed it).
• Income tax — introduced as a "temporary" wartime measure in 1917. It is still here.
• Women's contributions — women filled industrial and farm jobs; nursing sisters served at the front. The federal vote was extended to women who served as nurses or had relatives serving (1917), then to all women in 1918.
• Internment camps — over 8,000 Ukrainian Canadians and others from "enemy" nations were interned in camps.

• 66,000 Canadians killed
• 172,000 wounded
• Many thousands more disabled or affected by gas, shell shock (now called PTSD), and disease

The Vimy Memorial in France bears the names of 11,285 Canadians killed in France with no known grave.

WWI accelerated Canada's path to independence:

• Canada signed the Treaty of Versailles (1919) in its own name, separately from Britain
• Canada was a founding member of the League of Nations
• The 1931 Statute of Westminster gave Canada full legislative independence from Britain — directly influenced by wartime contributions
• War honours and casualties built a sense of Canadian national identity that influenced the 20th century

• "When was World War One?" → 1914–1918
• "How many Canadians served in WWI?" → Over 600,000
• "Why is Vimy Ridge important?" → First all-Canadian Corps victory
• "What ended WWI?" → Armistice on November 11, 1918

WWI questions are common on the test. Drill them on our [free Canadian citizenship practice test](/practice-test). For Vimy specifically, see [Why Is the Battle of Vimy Ridge Important to Canada?](/blog/battle-vimy-ridge-canada-significance).