The Russian Empire gradually entered World War I during the three days before July 28, 1914. This began with Austria-Hungary's declaration of war on Serbia, a Russian ally. Russia sent an ultimatum, via Saint Petersburg, to Vienna, warning Austria-Hungary not to attack Serbia. Following the invasion of Serbia, Russia began to mobilize the reserve army on the border of Austria-Hungary. Consequently, on July 31, Germany demanded Russian demobilization. There was no response, which resulted in the German declaration of war on Russia on the same day (August 1, 1914). Per its war plan, Germany disregarded Russia and moved first against France, declaring war on August 3. Germany sent its main armies through Belgium to surround Paris. The threat to Belgium caused Britain to declare war on Germany on August 4. The Ottoman Empire soon joined the Central Powers and fought Russia along their border.

Individual Measurements: 12.5mm x 16mm x 25.6mm

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