The Maji Maji Rebellion was an armed rebellion of Africans against German colonial rule in German East Africa. The war was triggered by German colonial policies designed to force the indigenous population to grow cotton for export. From Wikipedia
President Steinmeier seeks collective acknowledgement of Germany's violent past, committed to finding and returning abducted human remains, and promises to increase awareness of the atrocities back home; however, no explicit mention of reparations during the landmark visit.