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War on Serbia
Austria-Hungary declares war on Serbia -
War on Russia
Germany declares war on Russia -
War on France
Germany declares war on France -
War on Germany
The United Kingdom declares war on Germany, after Germany invades Belgium -
War on Germany/Russia
Austria-Hungary declares war on Russia and Serbia declares war on Germany -
Battle of Tannenberg
The beginning of the Battle of Tannenberg begins -
Blockage of goods
The United Kingdom announces that the North Sea is a military area, effectively creating a blockade of goods into Germany -
"War Zone"
Germany declares a "war zone" around Great Britain, essentially effecting a submarine blockade where even neutral merchant vessels were to be potential targets -
First use of poison gas
The Second Battle of Ypres begins. It is during this battle that the Germans first use poison gas -
Tsar Nicholas II
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Battle of Verdun
The Battle of Verdun begins. The Battle of Verdun was the longest battle of World War I and was one of the bloodiest. -
Battle of the Somme
The Battle of the Somme begins. During the Battle of the Somme, tanks are first introduced into battle. -
War on Germany
The United States declares war on Germany -
Treaty of Brest Litovsk
Russia signs the Treaty of Brest Litovsk, which is a peace treaty between Russia and the Central Powers. -
The Treaty of Versailles
WWI officially ends with the Treaty of Versailles being signed