Duchy of Courlandball was a German puppet state.
|Central Powers. Heil Kaiser!|
|Member states||German Empireball (chief) • Austria-Hungaryball • Ottoman Empireball • Kingdom of Bulgariaball|
|Co-belligerents||Emirate of Jabal Shammarball • Dervish Stateball • South African Republicball • Sultanate of Darfurball|
|German client states||Belarusian People's Republicball • Duchy of Courland and Semigalliaball (1918) • Crimean Regional Governmentball • Don Republicball • Kingdom of Finlandball • Democratic Republic of Georgiaball • Kuban People's Republicball • Kingdom of Lithuaniaball (1918) • Moldavian Democratic Republicball • Mountainous Republic of the Northern Caucasusball • Kingdom of Polandball (1916-1918) • Ukrainian Stateball • United Baltic Duchyball|
|Ottoman client states||DR Azerbaijanball • Emirate of Jabal Shammarball|