Did Buddhists ever actively participate in a major violent conflict? The great "religions of peace" like Christianity and Islam had some quite turbulent events that seem in major conflict with their primary commandments, but still in the name of faith - even "within" (like bloody wars between catholics and protestants).

Buddhism shuns all violence, but I'm curious how true to this philosophy did the believers remained through ages. Was there ever any major conflict involving violent confrontation, in which Buddhists would fight (violently, not passively) in defense of their religion? Are there any "shameful moments of Buddhism" like there are so many in other major religions?
Suggested reading: Buddhist Warfare - Michael K. Jerryson and Mark Juergenmeyer. A view of the contents:


Making Merit through warfare according to the Arya-Bodhisaattva-upayavisaya-nirdesa-sutra
Sacralized Warfare: The Fifth Dalai Lama and the discourse on religious violence.
Soldier-zen in wartime Japan
Buddhists in China during the Korean War
Onward Buddhist Soldiers: Preaching to the Sri Lankan Army
Militarizing Buddhism: Violence in Southern Thailand