Several of the Gurus took part in wars. The basic principle is that armed conflict is only acceptable when all peaceful methods have failed. There is no enemy in the combat – what is being opposed is the oppression being resisted. Therefore, when any person is wounded they should be helped. Bhai Kannayya performed this noble service during the wars of the Tenth Guru, Guru Gobind Singh. Moreover, no one should be attacked once they have surrendered. Sikh teachings suggest that use of indiscriminate weapons, such as weapons of mass destruction, is wrong.