In the aftermath of Nader's crippling defeat and expulsion from Ottoman Baghdad, the commander who was put in charge of the 12,000 soldiers to maintain the siege of the city, Mohammad Khan Baluch, fled from Mesopotamia and returned to southern Persia, where, taking advantage of Nader's shattered prestige due to his ignominious defeat at the hands of Topal Pasha at the Battle of Samarra, Mohammad Khan raised the banner of rebellion in the south of the country. Wikipedia