2nd » World War I: United States President Woodrow Wilson asks the Congress of the United States known as U.S. Congress for a declaration of war on German Empire known as Germany.
9th » World War I: The Battle of Arras (1917) e.g Battle of Arras the battle begins with Canadian Corps executing a massive assault on Vimy Ridge.
12th » World War I: Canada or Canadian forces successfully complete the taking of Battle of Vimy Ridge or Vimy Ridge from the Germans.
16th » Vladimir Lenin returns to Saint Petersburg or Petrograd, Russian Provisional Government known as Russia from exile in Switzerland.