The Peace Palace Library will commemorate the First World War Centenary with a series of blogs and items on the website. Please, check our second series on July 28!

June 28, 1914, Assassination of Archduke Franz Ferdinand of Austria, the heir to the Austro-Hungarian throne, who is killed in Sarajevo along with his wife, Duchess Sophie.

July 5, 1914, Austria-Hungary seeks German support for a war against Serbia in case of Russian militarism. Germany gives assurances of support.

July 23, 1914, Austria-Hungary sends an ultimatum to Serbia. The Serbian response is seen as unsatisfactory.

July 28, 1914, Austria-Hungary declares war on Serbia. Russia mobilizes.

Image: Austro-Hungarian Army Mobilisation, July 1914. Citizens in Budapest read about the Austro-Hungarian Army's mobilisation in newspapers at the start of the First World War, 30 July 1914.