Then it's going to be very difficult to make an argument that Mandela was not a terrorist.
>In the Anglo-Boer war a similar tactic was employed by the Boers to great effect, but I have never heard of anyone referring to their actions during this war as acts of terrorism.
The first hit I get for "Boer terrorism" is: http://www.angloboerwar.com/books/78-stevens-the-complete-hi...
( https://duckduckgo.com/?t=lm&q=Boer+terrorism )
Edit:
Sorry about going on about this, but I think that saying people are not terrorists because we agree with them is closely related to saying that people are terrorists because we don't agree with them. If "terrorism" has a meaning, the question of whether Mandela was a terrorist should be answered based on that meaning. If what we really mean to say is that we think Mandela was a great man who improved the lives of millions, we can just say that instead of arguing or insulting each other over semantics.