Isandlwana is synonymous with the greatest defeat of British forces by a native army; that is, one only armed with spears and shields. The only way in which defeat is possible in such situations is by employing such overwhelming forces that the sustained rate of fire from the defenders’ guns cannot kill or wound sufficient of the indigenous forces thereby resulting in defeat. So how was that possible at Isandlwana?
Bureaucracy and discipline is what makes any organisation effective. Without it, nothing works. The men cannot be fed or ammunition will not be ordered. This applies to a myriad of other seemingly mundane aspects in any organisation which ultimately makes the army such a potent force.