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archduke franz and his wife Sophie were shot to death by a 19-year-old Serbian nationalist Gavrilo Princip. Austria-Hungary was furious and, with Germany's support, declared war on Serbia on July 28 1914 -
Due to the assassination of archduke Franz Austria Hungary was furious and declared war on Serbia staring world war 1. -
Austria knew that conflict with Serbia would likely involve Russia, which saw itself as Serbia's protector. So Austria invaded Russia and won against the Russian Fourth Army. -
Germany declared Britain waters to be a war zone, which led to the sinking of vessels and they sunk one of the us vessels which started conflict between Germany and US. -
The first use of poison gas was from Germany. Asphyxiating gas released from cylinders by German specialist troops -
Italy declares war on Austria Hungary -
The Battle of Verdun was fought from 21 February to 18 December 1916 on the Western Front in France. -
The battle of the Somme was a battle fought by the armies of the British Empire and French against Germany -
The battle of somme ends with over 1 million casualites and over 300,000 deaths. -
The battle of verdun ends with 550,000 French and 450,000 Germany casualties. -
The United States declared war on the Germany. on April 6, 1917, nearly three years after World War I started -
The revolution was led by Bolshevik Party leader Vladimir Lenin. It was almost the bloodiest against the Duma's provisional government. -
Russia signs the Treaty of Brest-Litovsk with Germany. The Treaty of Brest-Litovsk was a separate peace treaty that ended Russia's participation in World War I. -
British and American forces entered Germany. -
The Treaty of Versailles was the most important of the peace treaties of World War I. It ended the state of war between Germany and the Allied Powers. It was finally signed out of france June, 28, 1919.