Conversation so far:
what were age regiments used for by chiefs
Young men were taken away and grouped together by age for the development of military system.
What Chief started the age regiments
the young men were grouped by chief Dingiswayo
Who was Dingiswayo chief of
Dingiswayo was Chief of the Mthethwa
During what period was Dingiswayo Chief of the Mthethwa
Dingiswayo was Chief of the Mthethwa from 1806 to 1817

Question: Why such a short time
Self-contained rewrite: Why was Chief Dingiswayo Chief of the Mthethwa for such a short time