1914–1915, the Russian Empire forcibly deported local inhabitants from Russian-occupied areas of East Prussia to more remote areas of the empire, particularly...

dates (during the immediate build-up to, or during the course of, World War I) from which a de facto state of war existed between nations. The table shows...

Technology during World War I (1914–1918) reflected a trend toward industrialism and the application of mass-production methods to weapons and to the technology...

During World War I (1914–1918), belligerents from both the Allied Powers and Central Powers violated international criminal law, committing numerous war...

countries, including Czechoslovakia, and from the former German provinces of Lower and Upper Silesia, East Prussia, and the eastern parts of Brandenburg...

invading East Prussia, the Russians planned to send two armies to East Prussia, and two armies to defend against Austro-Hungarian forces invading from Galicia...

against the Kingdom of Serbia during the First World War. The first campaign began after Austria-Hungary declared war on Serbia on 28 July 1914. The...

During World War I, German prisoner-of-war camps were run by the 25 Army Corps Districts into which Germany was divided. Around 2.4 million men were World...

King Frederick William I of Prussia welcoming the expelled Salzburg Protestants The Berlin Cathedral c. 1900 Prussian deportations (Polenausweisungen) were...

The United Kingdom was a leading Allied Power during the First World War of 1914–1918. They fought against the Central Powers, mainly Germany. The armed...