The Events of WWI
Key Dates in the First World War
When did World War I begin? What countries were involved? When did it end? This page provides a brief summary of the important events and battles of the war, from the start of the conflict through the peace treaties.
To learn more, please explore our Interactive WWI Timeline, which provides an in-depth look into the chronology of the war, using photographs, original video footage and audio recordings.
June 28, 1914
July 28, 1914
Britain declares war on Germany.
Austria-Hungary declares war on Russia.
France and Britain declare war on Austria-Hungary.
Japan declares war on Germany.
Austria-Hungary declares war on Belgium.
The United States declares its neutrality.