Imam Gurey conquests of Abysinnia.
The two most feared tribes were of Gerri and Harti. According to the book the Gerri are all horsemen knights whereas the Harti are popular infantry men who are ferocious fighters. The author compares the Harti to a famous Arab knight whose name was Hamzah al-Jufi.
"On the left was the Somali tribe of Harti, from the people of Mait; a people not given to yielding. There were three hundred of them, famous among the infantry as stolid as swordsmen.....One of the Arabs called Hamzah al-Jufi engaged in a battle to the death in front of the Imam of the Muslims. He was one of the footsoldiers and stood his ground and stood the test, confronting war with a full heart. He never struck one infidel whom he did not unhorse, dead. He killed so vast a number of them in the middle of the river, that the river water was turned red by the blood. The whole tribe of Harti was like him." Page 78.