The battle of Anfao was fought between the troops of rebel General Muhammad Askia and Sonni Baru, the legitimate ruler of the Songhai Empire on April 12, 1493, at Anfao, outside the capital of Gao, on the upper Niger. Despite being outnumbered, Askia's troops won the day. The victory of Muhammad Askia ended the Sonni dynasty.
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Text from the Wikipedia article “Battle of Anfao”, available under CC BY-SA 4.0.