The bicultural capital of Brussels was maintained as special district under the authority of a Reichskommissar.
In 1889, Wissmann was promoted to Captain and appointed as Reichskommissar for the German East Africa region where he was tasked with suppression of the Abushiri Revolt led by Abushiri ibn Salim al-Harthi.
Reichskommissar Josef Terboven ordered the Gestapo to retaliate, burning all buildings in the village, executing or sending the men to the Sachsenhausen concentration camp, and imprisoning the women and children for two years.