Second battle of Dongola
652 CE.
Shown on the map at 18.223°, 30.744°.
The second battle of Dongola or siege of Dongola was a military engagement between early Arab forces of the Rashidun Caliphate and the Nubian-Christian forces of the kingdom of Makuria in 652. The battle ended Muslim expansion into Nubia, establishing trade and a historic peace between the Muslim world and a Christian nation. As a result, Makuria was able to grow into a regional power that would dominate Nubia for over the next 500 years.
Text from the Wikipedia article Second battle of Dongola, licensed CC BY-SA 4.0.