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June 28

Assassination of heir to the Austrian throne Franz Ferdinand and his wife in Sarajevo.

July 5

“Hoyos Mission”: Kaiser Wilhelm II assures Austria-Hungary of Germany’s support.

July 23

Austria-Hungary delivers Serbia an ultimatum.

July 25

Mobilization of the Serbian Army. The Russian Crown Council resolves to support Serbia.

July 28

Austria-Hungary declares war on Serbia.

July 30

General mobilization of the Russian Army.

July 31

General mobilization in Austria-Hungary and Belgium.

August 1

Germany declares war on Russia. General mobilization …

Cite this page
Hirschfeld, Gerhard, Krumeich, Gerd and Renz, Irina, “Timeline”, in: Brill’s Digital Library of World War I. Consulted online on 21 September 2023 <>
First published online: 2015

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