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...

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...

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...

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,...

Germany entered into World War I on August 1, 1914, when it declared war on Russia. In accordance with its war plan, it ignored Russia and moved first...

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...

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

At the onset of World War I, Vietnam, nominally under the Nguyễn dynasty, was under French protectorate and part of French Indochina. While seeking to...

outset of World War II did not specifically forbid the aerial bombardment of cities – despite the prior occurrence of such bombing during World War I (1914–1918)...

diplomatic history of World War I covers the non-military interactions among the major players during World War I. For the domestic histories of participants...

China participated in World War I from 1917 to 1918 in an alliance with the Entente Powers. Although China never sent troops overseas, 140,000 Chinese...

During World War I (1914–1918), Brazil initially adopted a neutral position. They did this in accordance with the Hague Convention, in an attempt to maintain...

The Kingdom of Bulgaria participated in World War I on the side of the Central Powers from 14 October 1915, when the country declared war on Serbia, until...

The use of slave and forced labour in Nazi Germany (German: Zwangsarbeit) and throughout German-occupied Europe during World War II took place on an unprecedented...

from the start of World War I in 1914 until early 1916. However, in that year and a half there were many hostile engagements between Germany and Portugal...

to an unprecedented degree. All of the powers used lessons from their experiences on the home front during World War I. Their success in mobilizing economic...

The history of Canada during World War II begins with the German invasion of Poland on 1 September 1939. While the Canadian Armed Forces were eventually...

Although a member of the Triple Alliance, Italy did not join the Central Powers – Germany and Austria-Hungary – when the war started with Austria-Hungary's...

This is a timeline of declarations of war during World War II. A declaration of war is a formal act by which one nation goes to war against another. The...

The total number of military and civilian casualties in World War I was about 40 million: estimates range from around 15 to 22 million deaths and about...

following its long-standing policy of neutrality since the Napoleonic Wars, remained neutral throughout World War I between 28 July 1914 and 11 November...

neutral throughout World War I between 28 July 1914 and 11 November 1918, and despite domestic economic difficulties, it was considered "one of the most important...

outbreak of World War I, Ukraine was not an independent political entity or state. The majority of the territory that makes up the modern country of Ukraine...

until the end of World War I on 11 November 1918, the Grand Duchy of Luxembourg was under full occupation by the German Empire. The German government justified...

The German occupation of Belgium (French: Occupation allemande, Dutch: Duitse bezetting) of World War I was a military occupation of Belgium by the forces...

between 10 and 11 November 1918. At the start of World War I, King Carol I of Romania favored Germany, while the nation's political elite favored the...