 The traditionalist view received its most prominent exposition the same year as it was decisively codified in international law, in the first additional protocol to the Geneva Conventions. Michael Walzer’s Just and Unjust Wars, first published in 1977, has been extraordinarily influential among philosophers, political scientists, international lawyers, and military practitioners. Among its key contributions were its defence of central traditionalist positions on national defence, humanitarian intervention, discrimination, and combatant equality.