- Just Cause. A state may launch a war only for the right reason.
- Right Intention. A state must intend to fight the war only for the sake of its just cause.
- Proper Authority and Public Declaration. A state may launch a war only if the decision has been made by the proper authorities and made public.
- Last Resort. A state may resort to war only if it exhausted all peaceful alternatives to resolving the conflict.
- Probability of Success. A state may not launch a war if it can foresee that doing so will have no measurable impact on the conflict.
- Proportionality. Prior to going to war, a state must weigh the expected universal goods (e.g., securing the just cause) against the expected universal evils (e.g., casualties).
Or is the decision to send troops into battle a separate decision that requires additional justification? If so, what could justify that decision?