For centuries, people have refused to fight and kill because to do so would go against their moral, religious, or ethical beliefs. For many years, the refusal to fight in the military when called to do so was a crime punishable by law. In some parts of the world, this is still the case.
The struggle to stay out of the fight has been a long one, and in this gallery, we remember all the major events in the history of conscientious objection. Click on to find out more.