The Atlantic U-boat movement of World War I, also known as the "First Battle of the Atlantic" about the World War II campaign of the same name, was a long-running naval battle between Ger ...

During World War I, the 1917 French Army mutinies occurred among French Army men on the Western Front in Northern France. They began shortly after the Nivelle Offensive's paramount engagement, ...

After added than two and a half years of efforts by President Woodrow Wilson to retain the United States out of the battle, the United States entered World War I in April 1917. Apart from an Anglop ...

The Russian Revolt was a political and social revolution that began during the First World War in the former Russian Empire. The Russian Revolution was an arrangement of two processes that started ...

The Battle of the Somme, usually known as the Somme Offensive, was a World War I combat in which the British Empire and the French Third Republic involved the German Empire. It took place on both s ...

The Combat of Verdun took place on the Western Front in France from 21 February to 18 December 1916. The combat, which took place on the slopes north of Verdun-sur-Meuse, was the longest of the Fir ...

The Empire of Japan, led by Prime Minister Kuma Shigenobu, submitted the Twenty-One Demands to the administration of the Republic of China on 18 January 1915, during World War I. Japan's domina ...

The RMS Lusitania was a British-registered cruise liner destroyed by an Imperial German Navy U-boat on 7 May 1915 near 11 miles off the coast of Kinsale, Ireland, during World War I. The attack occ ...

During World War I, the Ottoman Empire committed the Armenian genocide, which resulted in the systematic death of around one million ethnic Armenians. It was accomplished mainly by mass executions, ...

In 1915, Italy joined the First World War intending to complete national unity. As a result, the Italian participation in World War I is sometimes known as the Fourth Italian War of Independence, u ...