 Complete the following phrase:  The Battle of Otlukbeli was fought between the eastbound-proceeding Ottoman forces commanded by Sultan Mehmed II and the defending forces of Aq Qoyunlu  Turcomans under Uzun Hasan near Otlukbeli on August 11, 1473. The cause of the conflict was that Uzun Hasan maintained ties with the Byzantines, who moved to the east after the 