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June 28th 1914
Assassination of Archduke Ferdinand by Serbian Nationalist -
July 28th 1914
Austria-Hungary declares war on Serbia, effectively beginning the First World War. -
Aug 1st 1914
Germany declares war on Russia. France and Belgium begin full mobilization. -
Aug 3rd 1914
Germany declares war on France, and invades neutral Belgium. -
Aug 7th 1914
The first British troops land in France. -
Aug 12th 1914
Great Britain and France declare war on Austria-Hungary. Serbia is invaded by Austria-Hungary. -
Aug 23rd 1914
Japan declared war on Germany -
Nov 1st 1914
The Ottoman Empire officially entered World War One after Russia declared war on the Empire for bombarding its Black Sea ports -
Feb 4th 1915
Germany declares the waters surrounding British Isles to be a war zone in which ships can be sunk without warning. -
April 24th 1915
The deportation of Armenian intellectuals, sometimes known as Red Sunday, was the first major event of the Armenian Genocide -
April 26th 1915
Treaty of London -
May 7th 1915
British ocean liner Lusitania is torpedoed without warning by a German submarine off the south coast of Ireland. Within 20 minutes, the vessel sank into the Celtic Sea. Of 1,959 passengers and crew, 1,198 people were drowned, including 128 Americans. -
July 1st 1916
The Battle of the Somme, also known as the Somme Offensive, was a battle of the First World War fought by the armies of the British Empire and France against the German Empire. -
Nov 21st 1916
Britannic sinks in Aegean Sea. The Britannic, sister ship to the Titanic, sinks in the Aegean Sea on this day in 1916, killing 30 people. -
Jan 9th 1917
Germany, determined to win its war of attrition against the Allies, announced the resumption of unrestricted warfare -
March 3rd 1917
Russia's February Revolution (so named because of the Julian calendar that Russians still used at the time) began with rioting and strikes in St. Petersburg (Retrograde) -
April 6th 1917
the United States formally declared war against Germany and entered the conflict in Europe -
June 25th 1917
The first American troops land in France. -
Aug 14 1917
China declares war on Germany & Austria -
Nov 5th 1917
Gen Pershing & US troops see action on Western Front for 1st time -
Jan 8 1918
Speech on War Aims and Peace Terms, President Wilson set down 14 points as a blueprint for world peace that was to be used for peace negotiations after World War I. -
March 4th 1918
The outbreak of 1918 was named the Spanish influenza. -
Nov 11th 1918
Fighting in World War I came to an end following the signing of an armistice between the Allies and Germany that called for a ceasefire effective at 11 a.m.– it was on the 11th hour of the 11th day of the 11th month. -
November Spain 1918
Spanish Flu Pandemic Ends. By the summer of 1919, the flu pandemic came to an end, as those that were infected either died or developed immunity. ... Since 1918, there have been several other influenza pandemics, although none as deadly. -
Jan 18th 1919
A few months after the end of World War I, leaders from the Allied nations began a series of discussions that became known as the Paris Peace Conference to settle issues raised by the war and its aftermath. -
June 28th 1919
Germany signed the Treaty of Versailles, officially ending its involvement in World War I. ... Germany and the Allied Powers had signed an armistice on Nov. 11, 1918.
