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World War I
At the beginning of the 1900s, military and
political tensions existed between some of the
countries of Europe. The assassination of the heir
to the throne of Austria-Hungary was the spark
needed to fire up a war that involved the world.
World at war Although most of the
fighting took place in Europe, there was
also fighting in the Middle East, in
Africa, and in the German colonies in
China and the Pacific Ocean.
German
triplane
1915
The German’s
zeppelins made
frequent nighttime
bombing raids over
British cities.
1914
TIMELINE OF WORLD WAR I
The assassination of Archduke Francis
Ferdinand on June 28, 1914, caused
Austria-Hungary to declare war on Serbia.
European countries took sides, and by
August The Great War had begun.
WHO’S WHO?
OTwo main groups battled each other—
the Allies led by the British, French, and
Russian armies, and the Central Powers
led by the German, Austro-Hungarian, and
Turkish armies.
OThe British and French armies included
many recruits from their colonies and
territories around the world.
OIn total, nearly 30 countries were drawn
in to take part in the fighting.
OThe US joined the war in 1917.
HISTORY AND POLITICS
O Warships: Fleets of warships were
used to protect supply ships from
attacks by the German U-boats.
O Aircraft: Biplanes and triplanes were
used to fly over enemy lines to observe
their movements and take photographs.
O Vehicles: Horse-drawn vehicles were
gradually replaced by mechanical ones
to transport men and supplies to and
from the front line.
O Tanks: The first tanks used in 1916
were not very reliable, but a year later
they were leading the way across to the
enemy trenches, shielding the troops.
MILITARY TRANSPORTATION
Horse-drawn
ambulance
Allied powers
Central powers
Neutral nations
Key battle sites
JUTLAND
VERDUN
GALLIPOLI
Russia
Austria-Hungary
Germany
France
Algeria
Italy
Great Britain
Libya
Morocco
Tu r k e y
Portugal
Tunisia
Egypt
Bulgaria
Greece
SerbiaRomania
(The Ottoman
Empire)
Western
Front
Atlantic Ocean
Mediterranean Sea
Black Sea