Alberico Gentili, De Jure Belli Libri Tres (1588-1599)

Alberico Gentili (1552-1608) was an Italian jurist, practicing lawyer and professor of law at Oxford University, who is consistently mentioned as a key figure at the very origins of modern international law. Just a few years before Hugo Grotius, Gentili took substantial steps in the development of a secular jurisprudence. Yet, his standing as a “pioneer” of the modern concepts of international law has been overshadowed by the preeminence of Grotius, the Dutch jurist generally regarded as the father of international law.

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B. H. Liddell Hart, Strategy (1954)

The origins of Liddell Hart’s indirect approach are twofold. From a theoretical perspective, he is writing in response to military and political leaders who he claims misread and misapplied the theory of 19th century Prussian military thinker Carl von Clausewitz. From an empirical perspective, he is digesting the experiences of the World Wars, especially the stalemated trench warfare of the Great War and the mechanized and aerial battles of the fight against Hitler. Liddell Hart argues vigorously that the application of poorly understood Clausewitizian strategy fueled the bloodbath that was World War I and the slow adaptation of alternatives during World War II, all of which called into question the validity of the old theory and demanded reformulating how military force might be applied to achieve political aims.

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Emmerich de Vattel, The Law of Nations (1758)

The Law of Nations had a particular impact on the American revolutionaries of the late 18th Century and early 19th Century. Vattel’s ideas were utilized to argue against the tax burden which the British Crown levied on the American colonies. Early American lawyers and jurists were exuberant Vattelophiles. In 1775, Benjamin Franklin received three copies of a new edition on behalf of the Continental Congress and, in thanking his friend Charles Dumas for sending them from the Netherlands, he remarked that they “came to us in good season, when the circumstances of a rising State make it necessary to frequently consult the law of nations” and that “[the book] has been continually in the hands of the members of our Congress now sitting."

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Francisco de Vitoria, Relectiones (1538-1539)

War is essential in Vitoria’s work because Vitoria’s concept of sovereignty is elaborated mainly in terms of the sovereign’s right to wage war. As Vitoria constructs a law of nations, administered by the sovereign, he reintroduces Christian norms as universal rules endorsed by jus gentium. Evangelizing is authorized not by divine law but by the law of nations, and may be likened now to travelling and trading. Vitoria argues that “…ambassadors are inviolable in the law of nations (jus gentium). The Spanish are the ambassadors of Christendom, and hence the barbarians are obliged at least a fair hearing and not expel them.” Thus, acceptance of the Christian faith could not be forced and should not serve as an excuse for conquest.

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François de Callières, The Art of Diplomacy (1716)

In The Art of Diplomacy, secret diplomacy is considered as embedded in the art of negotiation. In this regard, Callières notes that secrecy is absolutely necessary for the generation of confidence and understanding. He advocates that secret negotiations could help maintain peace and thus are necessary to manage relationships between states. Callières believes that before a diplomat could progress towards a negotiated settlement of a dispute, confidence and confidentiality have to be established. He explains that “an able minister will take care that no man shall penetrate into his secret before the proper time.”

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Giulio Douhet, The Command of The Air (1921/1927)

Giulio Douhet, an Italian army officer who never learnt to fly, first published one of military theory’s most recognized and controversial works on airpower, The Command of The Air, in 1921. Just three years after the end of the First World War and the first widespread use of airplanes in warfare, this new technology had yet to be fully integrated into military strategy. Douhet advocated a new strategic application for what he identified as the airplane’s superior capabilities in order to avoid the destructive stalemate of the First World War in future wars. Promising a quick and decisive end to war, The Command of The Air synthesized concepts, namely strategic bombing, an independent air force, the dominance of an offensive strategy, and breaking the will of the civilian population, among others, which contributed to the development of the modern air force.

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Herodotus, The Histories (5th Century BCE)

Herodotus, who wrote a generation after the Persian Wars, puts these battles in the context of a great clash of civilizations, between Greek freedom and Asian despotism. He seeks to explain why and how a relatively poor, small, and divided collection of Greek-speakers were able to defeat a much larger, wealthier, and centralized empire. On the battlefield itself, on land and at sea, the Greeks were better disciplined and employed superior close-order tactics, such as staying in ranks rather than attempting to kill the greatest number of enemy soldiers in open combat. But Herodotus' generic answer reflected the views of his contemporaries and greatly influenced the West's understanding of itself: "As long as the Athenians were ruled by a despotic government, they had no better success in war than any of their neighbors. Once the yoke was flung off, they proved the finest fighters in the world."

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Jean-Jacques Rousseau, “Abstract” and “Judgment” of Saint-Pierre’s Project for Perpetual Peace in Europe (1761, 1782)

A word should be said about Rousseau’s place among the various schools of international relations theory. Because he wrote so little about international relations directly and because his one published work on the subject is so ambiguous, his views defy simple categorization. His approval of the goal of perpetual peace and dissatisfaction with the continuation of the state of nature among nations would suggest that he belongs among the modern idealists. Yet he evinces none of the modern idealists’ confidence that this goal would be achieved or dissatisfaction remedied. Here, as in other areas of his thought, Rousseau offers much more of a diagnosis of the modern condition than a cure for it.

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Jeremy Bentham, Principles of International Law (1786-1789/1843)

The older phrase law of nations, according to Bentham, refers to a certain discursive space only through the force of custom, or convention. However, he believed that a more appropriate designation should go beyond mere convention. According to Bentham, the phrase law of nations is a sign relying on the mediation of convention. Without the convention, "the force of custom," the phrase law of nations might be understood as one designating the domestic, municipal law of diverse nations. On the other hand, Bentham explains, that international is a term that stands in no need of the mediation of custom and convention.  To put it more simply, Bentham proposed to replace the concept of the law of nations with that of the law between nations.

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John Maynard Keynes, The Economic Consequences of the Peace (1919)

In 2014, a slew of new books examining the “war to end all wars” appeared on the shelves of libraries and booksellers around the world. The centennial of that bloody conflict seemed an appropriate time to revisit its causes and consequences. While some of these efforts offered genuinely new insights, most did not. Beyond these freshly bound attempts to encapsulate one of the most destructive events of human history, there is a rich, much older set of works that any serious student of strategy and diplomacy should consider. Among these, The Economic Consequences of the Peace holds a special place.

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