On Grand Strategy

John Lewis Gaddis, a Yale historian who co-taught a celebrated seminar on grand strategy, distills 25 centuries of leadership lessons into a work spanning the Persian invasion of Greece to the presidency of Franklin D. Roosevelt. He defines grand strategy as "the alignment of potentially unlimited aspirations with necessarily limited capabilities" (21) and argues that effective leadership requires holding opposing ideas in mind while retaining the ability to act.

Gaddis opens with the Persian king Xerxes at the Hellespont, the strait dividing Europe from Asia, in 480 B.C.E. Xerxes prepared to cross into Greece with an enormous army, but his uncle Artabanus warned that exhaustion and the elements would prove as dangerous as the Greeks. Xerxes dismissed these concerns, insisting that "Big things are won by big dangers" (3). Gaddis frames this confrontation through Isaiah Berlin's distinction between hedgehogs, who "relate everything to a single central vision" (4), and foxes, who "pursue many ends, often unrelated and even contradictory" (4-5). Berlin, a Latvian-born philosopher who emigrated to England after witnessing the Bolshevik Revolution as a child, drew the concept from a fragment by the ancient Greek poet Archilochus. Gaddis reinforces the framework with Philip Tetlock's 2005 study of more than 27,000 expert predictions, which found that self-identified foxes were far more accurate forecasters than hedgehogs. Xerxes' invasion failed as a hedgehog enterprise, yet pure fox-like caution risked paralysis. The solution, Gaddis argues, lies in F. Scott Fitzgerald's test of a first-rate intelligence: "the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function" (14). The most effective leaders combine the hedgehog's sense of direction with the fox's sensitivity to surroundings.

The case of Pericles and Athens illustrates how a brilliant strategy can collapse when its architect loses balance. After Xerxes' defeat, Athens and Sparta emerged as dominant Greek powers, each specializing because scarcity prevented dominance in both land and sea. Pericles developed a maritime culture and empire whose appeal was meant to be simultaneously distinctive and universal, but he celebrated equality within Athens while relying on coercion throughout the empire. As the Peloponnesian War approached, Pericles grew rigid, refusing all Spartan compromises and insisting that conceding even trivial demands would destroy Athenian credibility. He died of plague in 429 B.C.E., a plague amplified by his own defensive strategy of crowding the population within Athens's Long Walls, the fortifications linking the city to its port. Athens then descended from democratic humanism to imperial brutality, culminating in the disastrous Sicilian expedition that trapped more than half the empire's military far from home.

Gaddis turns to Sun Tzu's Art of War, which tethers abstract principles to concrete practices, and to the career of Octavian, later the Roman emperor Augustus, as an example of such tethered learning. When Julius Caesar was assassinated in 44 B.C.E., the 18-year-old Octavian, Caesar's great-nephew and adopted heir, began leveraging limited assets against more powerful rivals. Through painful self-assessment Octavian recognized he was no battlefield commander, delegating military operations to capable allies like Marcus Agrippa while focusing on political maneuvering. After defeating Mark Antony and Cleopatra at the naval battle of Actium in 31 B.C.E., Octavian shifted from reactive navigation to patient cultivation, using time to transform the Roman republic gradually into an empire so subtly that Romans hardly noticed the change. Taking the honorary title Augustus, he announced the empire was large enough, enforced the rule of law, and commissioned Virgil's national epic, the Aeneid.

The tension between the demands of souls and states occupies Gaddis's treatment of Augustine and Niccolò Machiavelli. Augustine, bishop of the North African city of Hippo in the late Roman period, argued in The City of God that order must precede justice and that war could sometimes be a lesser evil than peace, framing standards for just war as a procedural checklist rather than absolute commandments. Machiavelli, born in Florence in 1469, accepted that God leaves roughly half of human affairs to human governance through virtù, or skillful planning independent of divine intervention. Berlin's 1953 lecture on Machiavelli provides Gaddis's synthesis: Machiavelli confirmed that ideals cannot be fully attained, that statecraft involves competing realisms, and that the incompatibilities between private morality and public necessity must simply be lived with.

The contrasting reigns of Philip II of Spain and Elizabeth I of England test these ideas against the demands of statecraft. Philip micromanaged a global empire he regarded as a sacred trust, refused to prioritize among competing ends, and attributed failures to God's testing of his faith. Elizabeth delegated authority, nationalized English Catholicism, and prized pivoting, keeping herself free by balancing suitors, counselors, and foreign powers in what Gaddis calls an "elaborate interlocked design so cunningly and delicately balanced" (129) that she always retained room to maneuver. Philip's invasion of England failed catastrophically in 1588 when the Spanish Armada was scattered by English fireships and storms.

The Armada's failure opened North America to English colonization. Elizabeth's light-handed approach set the template for British America as a diverse collection of colonies adapting to local conditions. After independence, James Madison's Federalist No. 10 addressed how a republic could expand without becoming a tyranny by deploying scale: A larger republic encompassed more factions, making it less likely that any single majority would dominate. The Constitution assumed slavery's legality without naming it; the Founders chose Union over immediate emancipation, betting that a strong state would eventually offer better prospects. John Quincy Adams voiced the era's central compromise: America would champion freedom in principle but keep great ends within available means.

Gaddis argues that Carl von Clausewitz and Leo Tolstoy together form the grandest of strategists. Clausewitz's concept of friction, the accumulation of small difficulties that causes plans to fall short, ties theory to experience. Tolstoy contrasts Napoleon, who could no longer acknowledge mistakes, with the Russian general Kutuzov, who understood that patience and time would drive the French from Russia. Both writers see overstretch as the greatest strategic danger.

Abraham Lincoln exemplifies the alignment of aspiration and capability. His debates with Senator Stephen Douglas demonstrated the practicality of a moral standard: Lincoln deployed logical argument to show that any justification for enslaving one person could be turned against another. His Civil War strategy of multiple simultaneous advances exploited the Union's superior numbers. His management of emancipation illustrated coup d'oeil, or intuitive strategic vision: He allowed practical measures to shift the war's purpose, then proclaimed emancipation as a military necessity after the Battle of Antietam provided a plausible victory, seizing the moral high ground and making foreign recognition of the Confederacy impossible.

The book's final arc traces how Woodrow Wilson's attempt to redesign the international order after World War I foundered on contradictions between lofty principles and political realities. Franklin Roosevelt, unlike Wilson, put America first while quietly repositioning geopolitics, extending military aid to the Soviet Union after Germany's 1941 invasion and waiting for Pearl Harbor to provide the moral authority of having been attacked. Over the next four years, Roosevelt rescued democracy at a cost in American lives of less than two percent of total participant casualties.

Gaddis concludes with Berlin as a unifying figure. Berlin's distinction between positive liberty, which yields choices to a higher authority and tends toward tyranny, and negative liberty, which preserves the freedom to choose, maps onto the book's historical pattern. Hedgehogs trying to herd foxes, from the elder Pericles to Napoleon to Wilson, flattened landscapes rather than adapting to them. Foxes with compasses, from Augustus to Elizabeth to Lincoln to Roosevelt, combined humility, flexibility, and the ingenuity to leverage inconsistencies. Proportionality, Gaddis concludes, is what grand strategy produces: the alignment of infinite aspirations with finite capabilities, bent toward freedom.