get off you lazy derriers and read some real history, of the sucess of the Afrikan German army!
Pretty harsh considering you can't even get his name correct.
His name was Paul von Lettow Vorbeck not Lettvow von Vorbeck.
He commanded the colonial forces in German East Africa (now Tanzania) only but he took the fighting at times into Portuguese East Africa, (now Mozambique) and the frontier areas of Northern Rhodesia (now Zimbabwe), British East Africa (now Kenya) and the Belgian Congo (now Zaire) which, although impressive, is hardly ALL over Africa.
His force did not prevent the capture of German East or indeed any of the Germany's African colonies and he abandoned German East Africa completely in 1917. He survived largely because he kept his force mobile but exercised no realistic control over any areas outside of the range of his guns. His excursions into neighboring colonies were always temporary strategic expediants, allowing him to retain local initiative and facilitate capturing Allied supplies to equip his men.
His force operated in guerilla fashion but were in fact a formally constituted unit of the German Army with regulation uniforms (for the officers and white troops at least), nominal pay and all the accoutrements that define regular army units. Where he fought pitched battles he generally used the initiative brought on by not having a fixed base of operation to achieve local (and temporary) superiority. He didn't always have things go his way though and in April 1918 at Korewa in Portuguese East Africa his advance guard was surprised by a British force and barely escaped, abandoning much of their reserve of ammunition and money to get away.
The wartime total of a quarter of a million Allied soldiers also includes the many thousands of native porters conscripted into the French, Belgian, Portuguese, British and British-Indian forces as labourers and for carrying stores. The actual numbers in action at any one time were much smaller. Comparatively few European troops were involved and none of the native levies had been earmarked for the other fronts. Lettow Vorbeck's resistance was certainly inconveniant for the Allies but could never be decisive as he could never hold ground and had to keep on the move constantly.
Lettow Vorbeck's East African campaign was certainly brilliant and a model of leadership and resistance but this thread is not about the history of World War One in Africa. It is solely about colonial warfare in WW1G and at the scale of the game it is impossible to replicate it with any accuracy or realism.