Official Belligerents:
Austro-Hungarian Civil Ensign
Austro-Hungarian Monarchy
Österreichisch-Ungarische Monarchie
Osztrák–Magyar Monarchia
Declared war at Serbia on: 28 July, 1914
German Colonies and Protectorates
Deutsche Kolonien und Protektorate
Joined the war on: 1 August, 1914 - Colonies and Protectorates of German Empire
Ottoman Flag
The Sublime Ottoman State
دولت عليه عثمانیه
Russia declared war at the Ottoman Empire on: 29 October, 1914
Puppet States:
Kingdom of Poland
Królestwo Polskie
Königreich Polen
Joined the war on: 5 November, 1916 - Puppet State of German Empire
Duchy of Courland and Semigalia
Königreich Litauen
Herzogtum Kurland und Semgallen
Joined the war on: 8 March, 1918 - Puppet State of German Empire
Belarusian People's Republic
Беларуская Народная Рэспубліка
Joined the war on: 9 March, 1918 - Puppet State of German Empire
Crimean Regional Government
Крымское краевое правительство
Joined the war on: 25 June, 1918 - Puppet State of German Empire
United Baltic Duchy
Balti Hertsogiriik
Apvienotā Baltijas hercogiste
Vereinigtes Baltisches Herzogtum
Joined the war on: 22 September, 1918 - Puppet State of German Empire
Questionable Belligerents (and Client States):
The Kingdoms and Lands Represented in the Imperial Council
Die im Reichsrat vertretenen Königreiche und Länder
Joined the war on: 28 July, 1914 - Part of Austro-Hungarian Monarchy
Flag of Kingdom of Hungary
Flag of Kingdom of Croatia-Slavonia
Lands of the Crown of Saint Stephen
A Magyar Szent Korona Országai Zemlje krune svetog Stjepana
Joined the war on: 28 July, 1914 - Part of Austro-Hungarian Monarchy
Condominium of Bosnia and Herzegovina
Kondominij Bosne i Hercegovine
Kondominium Bosnien und Herzegowina
Bosznia-Hercegovinai Kondomínium
Joined the war on: 28 July, 1914 - Part of Austro-Hungarian Monarchy
South African Republic
Zuid-Afrikaansche Republiek
Fight agaisn't the British Empire on: September, 1914
Somali Dervish Movement
Dhaqdhaqaaqii Daraawiishta
Fight agaisn't the British Empire on: 11 November, 1914
Emirate of Jabal Shammar
إمارة جبل شمر
Client State of Ottoman Empire: 29 October, 1914
Iranian Resistence Forces
نیروهای مقاومت ایران
Was formed on: 17 November, 1914
Sultanate of Darfur
سلطنة دارفور
Fight agaisn't the British Empire on: 1 April, 1915
Tuareg guerrillas
guérillas touaregs
Began the Kaocen Revolt on 1 December, 1915
Kingdom of Finland
Suomen kuningaskunta
Supposedly have joined the war on: May, 1918
Mountainous Republic of the Northern Caucasus
Горская Республика
Къушъхьэ Республик
Ламанхойн Республикa
Сувун Республика
Declared independence from Russian Empire on: 11 May, 1918
Notes: Because Germany had to much colonies during the Great War, I decided to create a separated site just for them.