The Zand forces under Ali-Morad Khan Zand and Nazar Ali Khan Zand shortly clashed with the Pasha's forces in Kurdistan, where they kept them at bay, whilst Sadeq Khan, with an army of 30,000, besieged Basra in April 1775. The Arab tribe al-Muntafiq, which was allied with the governor of Basra, quickly withdrew without any effort to reject Sadeq Khan from passing through the Shatt al-Arab, whilst the Banu Ka'b and the Arabs of Bushehr supplied him with boats and supplies.