How can we study modern warfare through the lens of culture? Different armies fought in different ways for reasons that don’t look very rational without considering cultural context. The ritualized tribal warfare of twentieth-century New Guinea looks more like middle school dodgeball than battle to us, but it probably would have been very familiar to the Mycenaean Greeks of the Iliad. When different cultural systems collide, the results can be devastating to one side until it adapts: in the initial Mongol invasion of Japan in 1274 the samurai challenged the invaders to single combat, only to discover with disastrous results that the Mongols did not share their idea of what a battle was supposed to be. And this isn’t just a topic for military historians. Understanding how culture bounds the way we (and our enemies) think about warfare will help to ensure we’re on the winning side in future conflicts; better to be the marauding Mongols than the stupefied samurai, looking for a divine wind to save them from their lack of cross-cultural understanding.