In 1591, at the Battle of Tondibi, one of the largest and wealthiest empires in African history deployed its trump card: thousands of trained cattle stampeding toward a vastly outnumbered Moroccan force. Then the arquebuses and English cannons roared, a sound the herd had never heard, and the panicked animals wheeled around and crushed their own infantry. Centuries of sophisticated state-building unraveled in a single afternoon.

This episode traces the Songhai Empire from its origins among the boat builders, hippo hunters, and farmers of the Niger River, through its conquest by Mali and its patient reemergence, to the ruthless expansion of Sunni Ali and the administrative genius that made Timbuktu a global center of scholarship. It ends with the geopolitical butterfly effect that destroyed it all: a Moroccan sultan's war debts, an invasion led by a Spanish-born commander, and a professional army that had mastered everything except the one technology that mattered.

• The Niger River as a 500-mile superhighway, and the Sorko, Gao, and Do peoples who built an identity on it
• Ibn Battuta's 1353 visit: cowrie-shell currency from the Maldives and a cucumber "which has no like"
• Sunni Ali's conquests of Timbuktu and Djenne, and why the chroniclers ruined his reputation
• Why Morocco marched an army across the Sahara: a bankrupt sultan, Portuguese war debts, and the salt mines of Taghaza
• Tondibi's lesson: 40,000 troops, swords against gunpowder, and the technological blind spot that ended an empire