hi
The zulus had many medications to help them during battle, one of the main ones was the snuff that each zulu warrior carried with him. This drug was administered during battle by simply the warrior would open his pouch, get a pinch, and snuff it. This snuff gave the warrior the feeling that he was invincible and was able to do far more than he would normally. It also gave the zulu the courage to carry on fighting when he was wounded.
Ill try and find you a link with a bit more information than my brain can give you.
Thanks joe