Recently I have personally discovered Rev. Emmanuel Charles McCarthy. He is a powerful advocate for Christian Non-Violence or Pacifism. Years ago I came across Dorothy Day and the Catholic Worker movement. That was my first experience with Christian pacifism. More and more my inclinations lean in this direction. In fact, though I am willing to consider other arguments, and will change my mind if necessary, for now I cannot see any compatibility between being a follower of Christ and any kind of violence, including going to war. I say this while still finding stories of heroism in war deeply moving.
Here is one of several talks you can find online by Rev. Emmanuel Charles McCarthy: