Answer: He came up with the short stabbing spear and the long shield
Step-by-step explanation:
Before Shaka Zulu came to prominence, the tribes in Southern Africa at the time fought with long spears and short shields. Each side would stand apart from the other and throw their long spears to try to kill as many of the other ones as they could.
Shaka Zulu decried this method and came up with a short stabbing spear and a long shield. With the long shield made of cow skin, Zulu warriors would be able to hide from the spears thrown by their enemies and then when they ran out of spears, Zulu warriors would attack them and use shot stabbing spears which were made for close combat, to defeat them.