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The Conversation
The Conversation
Monica Duffy Toft, Professor of International Politics and Director of the Center for Strategic Studies, The Fletcher School, Tufts University

Overconfidence is how wars are lost − lessons from Vietnam, Afghanistan and Ukraine for the war in Iran were ignored

Plumes of smoke and fire rise after debris from an intercepted Iranian drone struck an oil facility, according to authorities, in Fujairah, United Arab Emirates, on March 14, 2026. AP Photo/Altaf Qadri

Wars are rarely lost first on the battlefield. They are lost in leaders’ minds − when leaders misread what they and their adversaries can do, when their confidence substitutes for comprehension, and when the last war is mistaken for the next one.

The Trump administration’s miscalculation of Iran is not an anomaly. It is the latest entry in one of the oldest and most lethal traditions in international politics: the catastrophic gap between what leaders believe going in and what war actually delivers.

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