<P> In opposition to the Union of South Africa, which had joined the war, Boer rebels founded the South African Republic in 1914 and engaged in the Maritz Rebellion . Germany assisted the rebels, and the rebels operated in and out of the German colony of German South - West Africa . The rebels were defeated by British imperial forces . </P> <P> The Sultanate of Darfur forces fought against British forces in Anglo - Egyptian Sudan during World War I in the Anglo - Egyptian Darfur Expedition . </P> <P> During 1917 and 1918, the Finns under Carl Gustaf Emil Mannerheim and Lithuanian nationalists fought Russia for a common cause . With the Bolshevik attack of late 1917, the General Secretariat of Ukraine sought military protection first from the Central Powers and later from the armed forces of the Entente . </P> <P> The Ottoman Empire also had its own allies in Azerbaijan and the Northern Caucasus . The three nations fought alongside each other under the Army of Islam in the Battle of Baku . </P>

Which of the following nations was not part of the central powers