While there, he attempted to increase taxes on the local sharecroppers (muzari'un), which provoked the residents of the Hawf district to rise up in revolt. After Ishaq requested reinforcements from the caliph, the general Harthamah ibn A'yan arrived in Egypt with a large army and forced the rebels to submit. A short time afterwards Ishaq was dismissed in favor of Harthamah, having held the governorship for about a year.[10]