The question appears to reference the Zulu kingdom under King Shaka (early 19th century). Historical records indicate that Shaka's Zulu state engaged in extensive military expansion, conquering and absorbing numerous neighboring chiefdoms and clans in what is now KwaZulu-Natal and surrounding areas. This period, known as the Mfecane or Difaqane, involved widespread warfare, displacement, and reorganization of societies across southern Africa.
While "waging war" implies formal declarations, the Zulu expansion was characterized by systematic military campaigns against nearby peoples to consolidate power, acquire cattle, and control territory. Therefore, the Zulu leadership did indeed conduct large-scale armed conflict against neighboring groups.