Look at Sri Lanka, very bloody civil war between Buddhist majority and Hinduist minority. Atrocities done on both sides, ie at the end when rebels were losing and surrounded, state army was shelling civilians left and right. Another example - history of Ladakh province in northern India - conquered by buddhist armies some +-1000 years ago. Buddhist army, interesting term.

I also had this view that buddhism is a faith that promotes peace - which might be true, but you still have the same human beings behind it. History proves my naive idea wrong.

The current anti-Muslim pogroms in Myanmar (incited by the Buddhist clergy) would seem to provide a counter-example.