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Austria and Hungary had united as one and had taken over Croatia.
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Austria and Hungray had taken over Bosnia.
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Lewis Gun. It's an america ligthmachine gun that was introduced to the war in 1911.
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Gavrilo Princip had assasinated Franz Ferdinand.
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Chlorine gas had been first introduced to the war in 1914.
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In 1915 the first tank in world war 1 had been used.
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The battle of Gallipoli had taken place in 1915.
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In 1915 turkey had decided then to join the war.
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The battle of Somme toke atleast 4 months. 1,000,000 men were either wounded or killed which made it one of the biggest battles in the war.
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The first submarines had been introduced to the war in 1917.
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In 1917 America had entered the war.
