Many of the countries involved in the war had colonies in Africa. One of Germany's colonies in Africa was German East Africa, which today is Rwanda, Burundi and Tanzania.
British ships attacked a port in German East Africa in August 1914 and the German military commander there, Paul von Lettow-Vorbeck, organised his small military force to counterattack into British East Africa.
In response, British forces invaded German East Africa. They thought Vorbeck would be easily beaten because he only had a small army. However he was a clever commander who was excellent at planning battles.
Vorbeck's forces, made up of local warriors called Askaris, was never bigger than about 12,000. Using hit-and-run tactics he was able to hold back a force of more than 100,000 British Empire soldiers over the course of the war.
Only when news reached Africa of the armistice did Vorbeck finally surrender. He was one of the most talented generals of the war but fought in one of its forgotten campaigns.
German police and officials based in German East Africa who make up the German part of General Lettow-Vorbeck's army. The rest of the army is made up of local Askari warriors.
Askari fighters in training in German East Africa. General Lettow's small army held out for the whole of the war despite being hugely outnumbered.