• July 29. Britain warns Canada of deteriorating situation in Europe.
• Aug 02. Canada offers Britain troops for overseas service.
• Aug 05. Britain declares war. Canada is automatically at war.
• Aug 06. Britain accepts Canada's offer of troops.
• Aug 19.The first volunteers begin to arrive at Valcartier camp.
• Sept 04. Aproximately 32,000 men have assembled at Valcartier.
• Oct 03. 1st contingent Canadian Expeditionary Force sails for England.
• Oct 14. 1st contingent C.E.F. arrives in England.
• Dec 21. Princess Patricia's Canadian Light Infantry arrives in France. The first Canadian unit committed to battle in the Great War.

• Feb 07. 1st Canadian Division begins moving to France.
• Mar 03. 1st Canadian Division is made responsible for 6000m of front near Fleurbaix.
• April 01. 1st Canadian Division is moved north to the Ypres Salient.
• Apr 22. Battle of Ypres. First use of poison gas against French.
• Apr 24. Battle of St.Julien. First use of poison gas against Canadian troops. Canadian troops hold the line.
• May 05. Lt-Col John McCrae of the Canadian Expeditionary Force composed the well-known poem In Flanders Fields.
• May 18. Battle of Festubert.
• May 25. Second Canadian Division formed in Canada.
• June 15. Battle of Givenchy.
• Sept 19. Newfoundland Regiment lands at Suvla Bay in Gallipoli.
• Nov 16. Canadian's launched their first trench raid at Riviere Douve.
• Dec 20. Newfoundland Regiment evacuated from Suvla Bay
• Dec 25. 3rd Canadian Division formed.

1916

• Apr 06. The Battle of St.Eloi Craters.
• Jun 02. Battle of Mount Sorrel. Major General Mercer killed.
• Sept 15. Battle of Courcelette. First use of the tank and the rolling barrage.
• Sept 26. Battle of Thiepval Ridge.
• Nov. Sir Samuel Hughes Minister of Militia and Defense is sacked by Prime Minister Borden.

1917

• Apr 09. The Battle of Vimy Ridge.
• June 11. Prime Minister Sir Robert Borden introduced a Military Service Bill.
• Aug 15. Battle for Hill 70. First use of mustard gas against Canadians.
• Oct 26. The Battle of Passchendaele
• Aug 29. Conscription became law in Canada.
• Nov. Prime Minister Borden's Unionists win a majority in the federal election.
• Nov 20. The Battle of Cambrai.
• Dec 06. The Halifax Explosion. French munitions vessel Mont Blanc explodes in Halifax Harbour killing almost 1600 people.

1918

• Jan. Conscription now in force.
• March 21. German Offensive begins.
• March 30. Canadian Cavalry attack at Moreuil Wood.
• Aug 08. The Battle of Amiens. The beginning of what is known as Canada's Hundred Days.
• Aug 26. The Battle of the Scarpe.
• Sept 02. The Battle of the Drocourt-Queant Line.
• Sept 27. The Battle of the Canal Du Nord and Cambrai.
• Nov 02. The Canadian Corps capture the town of Valenciennes in its last major battle of the war.
• Nov 10. The Canadian Corps Reached the outskirts of Mons.
• Nov 11. At 10:58am Private George Price of the 28th Battalion is killed by a sniper. Two minutes later at 11:00am the armistice came into effect. The war was over.