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2 THE COURSE OF THE WAR
CAUCASUS BELLI AND CHAIN REACTION
A casus belli
is the reason
why a conflict begins
In the case
of World War I
that even was
assassination of the crown
prince of the Austro-Hungarian Empire
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FIRST PHASE (1914)
called war of movemen
Germany attacked rapidly
against France through Belgium
with the intention of dominating it quickly
SECOND PHASE (1915–1916)
In 1915
the Triple Entente troops
held back the Germans
on the Western Front
new phase began
trench warfare or war of position
both armies were unable to advance.
THE BATTLE OF VERDUN (1916)
On 21 February 1916
one of the bloodiest battles
of the war broke out
the Battle of Verdun
in 10 months
700.000 people killed died or wounded
To protect themselves
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Battle of Gallipoli (1915–1916)
the Triple Entente’s goal
was to attack
the strategic Dardanelles Strait
fighting in its territory
and help the demoralised Russian Empire
The war spread
to other parts of the world
during this period
operations were extended to territories of
the British Empire
The Aegean Region
The Caucasus
Africa
all the confines of the Ottoman Empire
The Middle East
German colonies
THIRD PHASE (1917–1918)
The last phase of the war
began in 1917
It ended signing
a peace treaty
signed in 1918
the powers of the Triple Entente
overcame this setback
thanks to the United States
In May 1915
the British ship Lusitania
was attacked by a Germans
1200 people died
that caused
many people to be
in favour of the United States
Allied counterattacks
and the losses
of support from Germany
knew that the war couldn't be won
the Weimar Republic was proclaimed
After the defeat of the central empires
the armistice was signed
and the war finished
