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...

The United States entered into World War I on 6 April 1917, more than two and a half years after the war began in Europe. Apart from an Anglophile element...

of World War I Austro-Hungarian entry into World War I French entry into World War I German entry into World War I Ottoman entry into World War I Russian...

The Russian Empire's entry into World War I unfolded gradually in the days leading up to July 28, 1914. The sequence of events began with Austria-Hungary's...

Austro-Hungarian entry into World War I British entry into World War I German entry into World War I Russian entry into World War I Ottoman entry into World War I American...

entry into World War I began when two recently purchased ships of its navy, which were still crewed by German sailors and commanded by their German admiral...

entry into World War I French entry into World War I German entry into World War I Ottoman entry into World War I Russian entry into World War I Color books...

of World War I Color book American entry into World War I French entry into World War I German entry into World War I Italian entry into World War I Russian...

entered World War I as a member of the Allies on 23 August 1914, seizing the opportunity of Imperial Germany's distraction with the European War to expand...

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...

British entry into World War I French entry into World War I German entry into World War I Italian entry into World War I Japanese entry into World War I Ottoman...

World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a global conflict between two coalitions: the Allies...

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 War...

British entry into World War I French entry into World War I German entry into World War I Italian entry into World War I Japanese entry into World War I Ottoman...

and HMHS Dover Castle. Anglo-German naval arms race German entry into World War I German Imperial Admiralty Imperial German plans for the invasion of the...

entry into World War I Austro-Hungarian entry into World War I British entry into World War I French entry into World War I German entry into World War...

The East African campaign in World War I was a series of battles and guerrilla actions, which started in German East Africa (GEA) and spread to portions...

The United States declared war on Germany on April 6, 1917, nearly three years after World War I started. A ceasefire and armistice were declared on November...

The Eastern Front or Eastern Theater of World War I  was a theater of operations that encompassed at its greatest extent the entire frontier between Russia...

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

States into World War II. The US had previously been officially neutral but subsequently entered the Pacific War, and after Italy's declaration of war and...

During the German entry into World War I, Chancellor Theobald von Bethmann Hollweg authorized the Septemberprogramm proposing that the German Empire use...

The development of tanks in World War I was a response to the stalemate that developed on the Western Front. Although vehicles that incorporated the basic...

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...

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...

years, but the first large-scale use of chemical weapons was during World War I. They were primarily used to demoralize, injure, and kill entrenched...

The Kingdom of Romania was neutral for the first two years of World War I, entering on the side of the Allied powers from 27 August 1916 until Central...

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...

cost Germany public sympathy in neutral countries and was a factor contributing to the American entry into World War I. This struggle between German submarines...

was one of the main theatres of war during the First World War. Following the outbreak of war in August 1914, the German Army opened the Western Front by...