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Germany, Austria-Hungary, and Italy create a secret alliance.
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The Russian Empire, Great Britain, and France form a union to combat the Triple Alliance.
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By invading Luxembourg and Berlin, Germany opens the Western front and gains military control over important industrial regions in France.The Western front eventually becomes a predominant region for battle to the Allied forces.
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Germany creates an outline for war against France and Russia. The plan requires an advance through Belgium and a rapid assault on Paris.
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The German and Austro-Hungarian armies primarily fought along the Eastern Front. Here the Central Powers battled the Russian Empire.
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Trenches were used and dug by both the Allies and the Central Powers in order to avoid losing the territory they had gained. They were also built to protect the troops from new weaponry (such as rifles, and artillery) which proved to be very lethal.
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A German submarine sinks a British ocean liner called the RMS Lusitania, which was designed to transport people from one sea port to another according to a schedule. German U-boats were used to attack the Allies trade routes.
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After multiple unrestricted German submarines attacked American ships, and the Germans sought to reach out to Mexico through the Zimmerman telegraph In hoped of an alliance, the US teams up with the Allies to fight back against the central powers.
