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The Assassination of Archduke Franz Ferdinand, heir tp the throne of Austria-Hungary empire. This ignited the spark of the beginning of the war.
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Unofficial truce declared by soldiers. Both sides began singing and eventually soldiers filled "No mans land" and began a small soccer game. For a short period of time both sides got along.
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First use of poison gas by German troops causing second war of Ypres.
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U-boat sinks the Lusitania, with loss of many American lives causing a German-US diplomatic crisis.
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Austria-Germany-Belgium forces invade Serbia.They over power and Exile the Serbian army.
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Recorded as the largest naval battle over the course of the war. Ultimately it had no clear victor.
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During the battle of Somme, tanks are introduced for the first time by the German army.
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The first airplanes were used in combat (aside from the Zeppelin) by the German forces.
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The Zimmeran Telegram is intercepted on February 24th and is published in the US press. Swears aliance between Mexico and Germany.
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The first US troops arrive in France and become the very first division.
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President Woodrow Wilson agrees to interveen and help Serbia.