Postscript: The Kissinger Lemma to von Clausewitz

By Publius (of the 21st Century) — No. 9

(These are additional observations complementing “The Valerian Trap…” from July 28, 2026)

In “On War”, the famous military theoretician and Prussian army officer von Clausewitz saw the phenomenon but did not fully grasp its strategic consequence. Having recently experienced French captivity following Prussia's defeat in 1806, Clausewitz watched as the Iberian Peninsular War of 1808–1814 unfolded. Napoleon installed his brother on the Spanish throne, occupied Madrid, defeated regular armies, and repeatedly demonstrated French battlefield superiority. Yet Spain and Portugal never became governable French possessions. Resistance returned after every apparent defeat, attacked communications, isolated garrisons, and forced France to disperse enormous strength, while Wellington's army supplied conventional pressure. France won battles, held cities, consumed men and treasure—and finally lost the peninsula.

Von Clausewitz did not overlook this war. Across his writings — the Kleiner Krieg lectures at the Berlin Kriegsschule and, within On War itself, the chapter on “The People in Arms” — he addressed people's war, the arming of the nation, and small war. But the terminology itself reveals the limitation. Spain remained for him principally a lesser form of military activity: irregular, dispersed, supplementary, and smaller than the contest of regular armies. What he did not fully develop was the strategic inversion within it. The weaker party did not have to become stronger or defeat France in France's military language. It merely had to deny France the political result for which the war was being fought. Even so, the seed of the answer was already in his own first principle — that war is the continuation of policy, and the political object, not the battlefield, is the true measure of victory. Kissinger did not correct Clausewitz so much as complete him.

Henry Kissinger supplied the missing lemma in 1969: “The guerrilla wins if he does not lose. The conventional army loses if it does not win.” This was more than an observation about guerrilla tactics. It identified unequal burdens of victory. The conventional power requires an affirmative conclusion—pacification, capitulation, territorial control, regime replacement, or an enforceable settlement. Its opponent may require only survival, continued resistance, and time. For the stronger party, another inconclusive victory becomes evidence of strategic failure. For the weaker party, another survived defeat becomes evidence that its strategy is working.

The United States has repeatedly encountered this asymmetry since World War II and repeatedly failed to master it. Korea ended without decisive victory. Vietnam ended in defeat. Iraq produced a rapid military overthrow but no durable political settlement, while enlarging Iranian influence. Afghanistan ended after twenty years in humiliation with the Taliban restored. These wars were not identical, and the Gulf War of 1991 remains an important exception precisely because its objective was political, and it was limited. The broader pattern is nevertheless hard to dismiss: the United States excels at destroying targets and organized forces, but repeatedly fails to convert military superiority into sustainable political order.

Iran makes the recurring error more precarious. Iran is not a guerrilla movement, although several of its partners and proxies operate irregularly. It is a large state with territory, armed forces, institutions, industries, and a long historical memory. Yet it can fight according to Kissinger's logic. Washington must produce a recognizable result. Tehran need only preserve the regime, retain retaliatory capacity, keep regional resistance alive, and prevent the United States and Israel from imposing their preferred end state. Iran can lose installations, commanders, missiles, and infrastructure and still deny victory. The United States can win nearly every engagement and emerge strategically weaker after every single encounter.

That, in my judgment, is already the direction of travel. The American position in the Middle East is weaker than it ever was before February 28, 2026. Iran has already absorbed the decapitation of much of its religious, political, military, and scientific leadership — including the killing of its Supreme Leader — and still resists. That is Kissinger's logic in its starkest form: the regime does not need to reconstitute what it lost. It needs only to survive long enough to prove that the loss did not settle anything. Much of America's leverage has been spent in military action that has not produced closure. Continued presence carries rising costs, while withdrawal may eventually become attractive because so little remains to be gained. Yet withdrawal would not end the consequences. Over decades—not tomorrow, and perhaps not soon—it could expose Israel to pressures it cannot manage alone and ultimately place its continued existence as a defensible state at risk. The ultimate Israeli nightmare is not immediate battlefield defeat, but the gradual exhaustion or departure of the outside power on which the regional balance has depended for so long. The continuation of strikes, retaliation, interrupted negotiations, and contests over Hormuz already demonstrates the failure to translate force into closure.

There is a serious older warning. Rome and Parthia, and later Byzantium and Sasanian Persia, fought recurrently for almost seven centuries. Their final great war, from 602 to 628, ended in a spectacular Byzantine victory but left both empires financially, militarily, and politically exhausted. Within a decade, the Arab-Islamic conquests had begun; within a generation, they destroyed the Sasanian Empire and stripped Byzantium of much of its eastern and southern world. Tactical victory had prepared strategic ruin.

History does not repeat mechanically. But historical oblivion offers no protection against recurring strategic logic. Von Clausewitz saw Spain but reduced its lesson to people's war and Kleiner Krieg. Kissinger provided the missing link and completed the thought: the stronger power loses when it cannot transform superiority into a political conclusion. The lesson was presented at enormous cost in Vietnam, re-presented in Iraq and Afghanistan, and NOT learned, and is now being ignored again in Iran. To call such repetition remarkable would be too neutral a judgment. Given the clarity of the historical record and the predictability of the outcome, it is a failure of strategic stewardship.