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Archduke assassinated
Archduke Franz Ferdinand, heir to Austria-Hungary's throne, and his wife, Sophie, are assassinated by Serbian nationalist Gavrilo Princip while the couple were visiting Sarajevo. -
Austria-Hungary declares war on Serbia.
Austria-Hungary declares war on Serbia. -
Germany declares war on Russia.
Germany declares war on Russia. -
Germany declares war on France.
Germany declares war on France. -
The United Kingdom declares war on Germany, after Germany invades Belgium.
The United Kingdom declares war on Germany, after Germany invades Belgium. -
Austria-Hungary declares war on Russia and Serbia declares war on Germany.
Austria-Hungary declares war on Russia and Serbia declares war on Germany. -
U.S. President Woodrow Wilson announces the U.S. will remain neutral.
U.S. President Woodrow Wilson announces the U.S. will remain neutral. -
The Battle of Tannenberg begins
The Battle of Tannenberg begins -
The First Battle of the Marne begins. Trench warfare begins as soldiers on both sides dig in.
The First Battle of the Marne begins. Trench warfare begins as soldiers on both sides dig in. -
The First Battle of the Marne begins. Trench warfare begins as soldiers on both sides dig in.
The First Battle of the Marne begins. Trench warfare begins as soldiers on both sides dig in. -
The United Kingdom announces that the North Sea is a military area, effectively creating a blockade of goods into Germany
The United Kingdom announces that the North Sea is a military area, effectively creating a blockade of goods into Germany -
The unofficial Christmas truce is declared.
The unofficial Christmas truce is declared. -
Germany declares a "war zone" around Great Britain
Germany declares a "war zone" around Great Britain, essentially effecting a submarine blockade where even neutral merchant vessels were to be potential targets. -
The Dardanelles Campaign begins.
The Dardanelles Campaign begins. -
The Second Battle of Ypres begins. It is during this battle that the Germans first use poison gas.
The Second Battle of Ypres begins. It is during this battle that the Germans first use poison gas. -
The Battle of Gallipoli begins.
The Battle of Gallipoli begins. -
The British ocean liner RMS Lusitania is sunk by German U-boat, U-20
The British ocean liner RMS Lusitania is sunk by German U-boat, U-20 -
Tsar Nicholas II takes personal control over Russia's armies.
Tsar Nicholas II takes personal control over Russia's armies. -
The Battle of Verdun begins.
The Battle of Verdun begins. The Battle of Verdun was the longest battle of World War I and was one of the bloodiest. -
The Battle of Jutland, the major naval battle of the war, begins.
The Battle of Jutland, the major naval battle of the war, begins.
