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Beginning of WW1
Archduke Franz Ferdinand of Austro-Hungary was assassinated by Gavrilo Princip, who was part of a Serbian government-backed nationalist group. -
Period: to
WW1
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All countries join
All countries involved except the U.S. have joined by this date. -
Battle of the Marne begins
First trench warfare -
North Sea declared a militarized zone
The blockade of Germany begins. -
Lusitania is sunk by U-boats
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Battle of Verdun
The longest battle of the war begins. -
Battle of Jutland
The only full-scale naval battle of the war happens. -
Battle of the Somme
The first tanks are introduced on the battlefield. -
United States enter the war.
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Russian Revolution
The Bolsheviks overthrow their government. -
WW1 ends
A ceasefire is held and ends the war.
