During World War I, the German Empire was one of the Central Powers. It began participation in the conflict after the declaration of war against Serbia...

between 1914 and 1918. When World War I started, Polish territory was split during the partitions between Russian Empire, the German Empire and Austria-Hungary...

Станислав Кельнер History of Germany during World War I Hungary in World War I Invasion of Serbia by Bulgaria during the First World War Salzburg Negotiations...

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...

see Diplomatic history of World War I. Below is a table showing the outbreaks of wars between nations which occurred during World War I. Indicated are...

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

Australia, the outbreak of World War I was greeted with considerable enthusiasm. Even before Britain declared war on Germany on 4 August 1914, the nation...

During World War I and World War II, Switzerland maintained armed neutrality, and was not invaded by its neighbors, in part because of its topography,...

participated in World War I from 1914 to 1918 as a member of the Allies/Entente and played an important role against the Imperial German Navy. Politically...

military history of Canada during World War I began on August 4, 1914, when the United Kingdom entered the First World War (1914–1918) by declaring war on Germany...