What native group did the Boers of southern Africa clash with when they migrated north?

The Boers of southern Africa clashed with the Zulu nation when they migrated north during the Great Trek in the 1830s and 1840s. This migration was driven by the desire to escape British colonial rule in the Cape Colony. The conflict between the Boers and the Zulu culminated in significant battles, including the famous Battle of Blood River in 1838. These encounters were marked by intense competition over land and resources.