'Umayr's governorship came to a sudden end in May 829, when he lost his life in battle against the rebels. With 'Umayr dead, Abu Ishaq decided to re-appoint Isa as governor, and the latter took over affairs from 'Umayr's son Muhammad. Isa then set out in a fresh attempt to quell the rebellion, but the Hawfis defeated him at Munyat Matar in September 829, and he was compelled to retreat to al-Fustat after burning his baggage.[12]