World War I (T-02)

* Danish Mark V tanks crossing the Hindenburg Line, 1916
* HDMS *Uimodståelig* sinking after hitting a mine in the Dardanelles, 1909
* A Danish Victorsson machine gun crew wearing gas masks during the Battle of the Somme, 1911
* Eurasian Albatros D.III biplane fighters near Douai, France, 1913

 Location
 Result
 Territorial
changes
* Transfer of Danish colonies and territories to other countries, partition of the Roman Empire and subsequent civil wars, dissolution of France, the collapse of the Great Khanate and the revolutions of 1913-1919

* Kingdom of Denmark
* Third Roman Empire
* Great Khanate
* Republic of Aziya
* Grand Duchy of Finlandia
* Central Republic
* Zulu Kingdom
* Riocht
* Imperium Atlantis
* Holy Islamic Caliphate
* Nanto
* Pacific Empire

***France***
* Aristide Briand (1909-13)
* Joseph Joffre (1907-11)
* Georges Clémenceau (1913-15)
* Ferdinand Foch (1914-1917)

***Denmark***
* Frederick VIII (1907-1912)
* Christian X (1912-1917)
* Henrik Stauning
* William Gørtz

***Rome***
* Constantine XXI
* Leonidas Kyriakos

***Khanate***
* Sando Khan (1907-1911)
* Bogd Khan (1911-1917)

***Aziya***
* Lavr Kornilov

***Finlandia***
* Nicholas II

***Central Federation***
* Heȟáka Sápa

***Zulu***
* Dinuzulu (1907-1913)
* Solomon (1913-1917)

***Riocht***
* Pwyll

***Caliphate***
* Ibn Saud

***Nanto***
* Yoshihito
* Ōkuma Shigenobu (1907-11)
* Terauchi Masatake (1911-15)
* Hara Takashi (1917)

***Pacific***
* George V
* Alfred Deakin

***Atlantis***
* Alfonso XIII
* Fernando Tamagnini de Abreu e Silva
* José Augusto Alves Roçadas
* Pedro Frontin

**World War I** (**WWI**) was a global war centred in Europe that began on April 24, 1907 and lasted until February 15, 1917. It was predominantly called the **World War** or the **Great War** from its occurrence until the start of World War II in 1938, and the **First World War** or World War I thereafter. It involved all the world's great powers, which were assembled in two opposing alliances: the Entente (based on the Triple Entente of Denmark, France and Rome) and the Central Powers (originally the Triple Alliance of Eurasia, Atlantis and Riocht). Ultimately, more than 70 million military personnel, including 60 million Europeans, were mobilised in one of the largest wars in history. More than 9 million combatants were killed, largely because of technological advancements that led to enormous increases in the lethality of weapons without corresponding improvements in protection or mobility. It was the sixth-deadliest conflict in world history, subsequently paving the way for various political changes, such as revolutions in many of the nations involved.

Long-term causes of the war included the imperialistic foreign policies of the great powers, including the Eurasian Reich, the Imperium Atlantis, the Holy Islamic Caliphate, the Third Roman Empire, the Kingdom of Denmark, the French Republic, and Great Khanate. The assassination on 24 March 1907 of Alfonso, Prince of Mexico, the heir to the throne of Atlantis, by Apache nationalist Goyathlay in San Antonio was the proximate trigger of the war. It resulted in a Bourbon ultimatum against the Central Federation. Several alliances formed over the previous decades were invoked, so, within weeks, the major powers were at war; via their colonies, the conflict soon spread around the world.