 Barquq instituted this change as a means to better control the Egyptian countryside from the rising strength of the Arab tribes.To that end, Barquq dispatched the Berber Hawwara tribesmen of the Nile Delta to Upper Egypt to keep the Arab tribes in check.During Barquq's reign, in 1387, the Mamluks were able to force the Anatolian entity in Sivas to become a Mamluk vassal state.