Remember that Shaka had also reformed the remnant Mthethwa clan under his rule. Zwide knowing this, planned to destroy the Zulu Kingdom in order to secure Ndwandwe domination of Zululand. However in 1820/5, he led his army into battle against the Zulu at the Battle of the Mhlathuze River. Unfortunately for Zwide his forces were crossing halfway across the Mhlathuze River when the Zulu forces attacked, the Ndwandwe army was scattered but Zwide wasn’t killed in that battle. Shaka and his impi then set out to go and kill Zwide before news had broken out that his (Zwide’s) army had been defeated. When they approached the gate they were chanting Zwide, Zwide, Zwide making them think it was their army aproaching the gate. and thus gained access. When they entered Zwide’s homestead they outnumbered his royal guard and killed Zwide. After King Zwide’s death, the Zulus marched to the Ndwandwe capital attacking it and taking the Ndwandwe by surprise.