Julius Caesar, Commentarii de bello Gallico (mid-1st Century BC)

There is some disagreement as to the character of De bello Gallico. Consisting of seven books by Caesar himself, it is completed in an eighth book by one of his generals, Aulus Hirtius. It has been suggested that they are something like battle-reports given to the Senate. Others have claimed that the books are nothing other than Caesar’s attempt to increase his popularity with the people.

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Machiavelli, The Art of War (1521)

In The Art of War, the only one of his major writings published during his lifetime, Machiavelli sets out to consider that topic from the standpoint of the superintending military commander. The Art of War is divided into a preface and seven books (chapters), presented as a series of dialogues that take place in the garden of Cosimo Rucellai, a friend of Machiavelli, who had died two years before the book was published. Cosimo and his guests, including a silent Machiavelli, respectfully question a visitor, Fabrizio Colonna, who is treated as a military authority. Fabrizio discusses how an army should be raised, trained, organized, deployed and employed. His model is the Roman Legion of the Republic, which he argues should be adapted to the contemporary situation of Renaissance Florence.

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Polybius, The Histories (circa 150 BC)

Polybius’ origins as a servant of the Achaean League is interesting in part because he offers a vision of international politics between world domination and total anarchy—a sophisticated alliance system of similar democratic regimes that fended off, on both the strategic and diplomatic level, domination by the more powerful Sparta, Macedon, and Rome. The corollary to the rise of Rome is the decline of the Achaean League, and the Histories of Polybius marks out various possibilities for how we can envision the ordering of international life. Political history reveals that there are far more possibilities to political life than those straitjacketed by modern theory may suppose. In this regard Polybius continues the tradition of classical political science and the classical approach to political history as expressed by Herodotus, Thucydides, and Xenophon.

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Rudyard Kipling, Kim (1901)

Rudyard Kipling is known today as the poet laureate of British imperialism and of the "White Man's Burden" – titles that are no longer much in fashion, although Kipling’s literary reputation has recovered in recent decades. His body of work includes the great novel, Kim, the story of an orphaned Anglo-Indian boy who is drawn into the Great Game – the geopolitical contest in the 19th century between Britain and Russia for the domination of Asia. For the British at least, this contest ultimately meant the control of India. Kim is a classic of the espionage genre – former CIA Director Allen Dulles had a well-read copy on his bedside table at the time of his death – but it is also a chronicle in miniature of the Great Game and the ethnography of the Indian subcontinent.

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Sun Tzu, The Art of War (c. 500-300 B.C.)

This classic of Eastern thought draws from Taoist philosophy and addresses the conduct of war and competition between states with poeticism unlike any classic of Western military theory. Thought to be the transcriptions of a general’s advice to his king, The Art of War emphasizes the use of the unorthodox and deception to overcome adversaries without jeopardizing the dynasty’s existence during a period of increase lethality of warfare.

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Tacitus, The Annales (early Second Century AD)

Like many of the great historians and thinkers of antiquity, Tacitus was renowned as a rhetorician and capable in the use of language, a skill that no doubt aided him as a writer of political history during the reign of the tyrannical Domitian. Indeed, his cognomen, meaning “the silent” is both ironical and true. For while Tacitus was known for speaking, in the Annales we see a deft use of omission and quietness in discussing the banal brutality of a Tiberius or a Nero, as well as double-meaning and discreet satire. Tacitus’ project is the problem of tyranny, and the possibility of virtue under tyranny.

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Thomas Hobbes, On the Citizen (1642)

Hobbes’s contribution to international relations theory is, for all its significance, rather indirect. Hobbes sets out to give an account of the origin and preservation of internal political order. His practical intention is to foster peace, primarily within and only secondarily among nations. Yet Hobbes invites us to draw lessons about international relations from his political theory when he identifies the state that countries find themselves in as the state of nature. The way to Hobbes’s theory of international relations is therefore largely inferential in character.

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Xenophon, The Education of Cyrus (ca. 370 BCE)

The Education of Cyrus is no simple paean to Cyrus, nor a handbook showing how to rule the world. Xenophon meditates on the conditions of uniting independent nations under unified political leadership, and the costs of so doing. The possession of empire can be as detrimental to the rulers as it is to the ruled. The Persians were once much like the Spartans, but they were changed by the rule of Cyrus. Xenophon thus shows that little is “natural” in the superior qualities of Greek soldiers when compared against the Persians. Keeping independent and separate political communities, with the attendant possibility of war and instability, seems very much wrapped up with the virtues necessary for successful warfare. The choice between empire and independence is one of the most fundamental political choices, and Xenophon deftly shows the Greeks and the later world the costs, limits, and possibilities of becoming an imperial power.

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