Only a small number of Germans were killed during the uprising but thousands of locals were killed....
The slavery and internal conflict had diminished the male population and by late 19th century 75% of the population was female or child. Consequentially the Germans had a chronic shortage of local men to work on their populations, resulting in various means to force people to work for them. Because of the lack of resources the German colony was also not economically successful.
In 1897 Carl Peters was taken to court by the Germans for his brutal treatment of the local black population and stripped of all his functions and his pension. Some years later he got back his pension from the emperor, in the 1930's he was fully rehabilitated by the Nazi's.
It was an Ashkari named Duni, whose hands were chopped off by Bushiri, who showed the Germans the location of Bushiri's secret camp that resulted in Bushiri's arrest. So the man above could be Dunia.