[1] He is known for his personal diary which records daily life and activities from 1912 to 1927 as a Fulbe raider and slave trader near the border of present-day Adamawa State, Nigeria, and Mayo-Tsanaga, Far North Region, Cameroon.
[2][3] Over a nine-year period, Yaji reportedly carried out over one hundred raids, rustling much livestock, enslaving some 2,016 captives, and killing at least two hundred men, one hundred and sixty-eight of whom he notes specifically.
[4] Originally written in Arabic, his diary provides a rare local perspective on early 20th century sub-Saharan daily life under colonial rule.
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