In 1838 , after Piet Retief and his party were killed by Dingane , and other Voortrekker parties were attacked at the Bloukrans and Bushman Rivers , Potgieter and another leader , Pieter Lafras Uys assembled a military force . To prevent schism and discord , the new Voortrekker leader in Natal , Maritz , diplomatically pronounced that both Uys and Potgieter were to be in command . However , a struggle between the hot-headed Uys and Potgieter ensued
attacked
Weenen massacre
Hendrik Potgieter