As long as a person is involved with warfare, trying to defend or attack, then his action is not sacred; it is mundane, dualistic, a battlefield situation.
Chogyam Trungpa (2010). “The Collected Works of Chogyam Trungpa: Volume Three: Cutting Through Spiritual Materialism; The Myth of Freedom; The Heart of the Bud dha; Selected Writings”, p.86, Shambhala Publications