Aspects of this topic are discussed in the following places at Britannica.
...when the Arab tribes of Tunisia joined in the battle against them, the Marīnids were overwhelmed, and Abū al-Ḥasan himself had to flee by sea from Tunis. His son and successor, Abū ʿInān, also invaded the eastern Maghrib, in 1356–57, but he, too, had to withdraw from Tunisia when faced with Arab tribal resistance.
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