yle . ▁Sa if ▁called ▁for ▁military ▁help ▁from ▁Pers ia , ▁and ▁in ▁ 1 7 3 7 ▁Pers ian ▁troops ▁arrived ▁led ▁by ▁N ader ▁Shah . ▁They ▁began ▁to ▁conquer ▁the ▁country . ▁The ▁Pers ians ▁left ▁in ▁ 1 7 3 8 ▁but ▁returned ▁from ▁ 1 7 4 2 ▁to ▁ 1 7 4 4 . ▁By ▁ 1 7 4 2 ▁the ▁Pers ians ▁were ▁in ▁control ▁of ▁much ▁of ▁the ▁country . ▁Sa if ▁was ▁trick ed ▁into ▁letting ▁them ▁take ▁the ▁key ▁for ts ▁of ▁al ▁J al ali ▁and ▁al ▁Mir ani ▁in ▁Mus cat ▁while ▁dr unk ▁at ▁a ▁ban quet . ▁He ▁died ▁soon ▁after , ▁the ▁last ▁of ▁his ▁dynast y . ▁The ▁Pers ians ▁took ▁Mus cat ▁and ▁then ▁attacked ▁So har ▁to ▁the ▁north . ▁After ▁end uring ▁nine ▁months ▁of ▁sie ge , ▁A hm ad ▁bin ▁Sa ' id ▁negoti ated ▁an ▁honor able ▁surrender . ▁ ▁The ▁Pers ian ▁commander ▁Ta qi ▁Khan ▁confirmed ▁him ▁as ▁governor ▁of ▁So har ▁and ▁B ark a ▁in ▁return ▁for ▁payment ▁of ▁t ribute . ▁ ▁Ass umption ▁of ▁power ▁ ▁By ▁late ▁ 1 7 4 4 , ▁A hm ad ▁had ▁control ▁over ▁large ▁parts ▁of ▁O man . ▁Bal ' arab ▁bin ▁Him yar ▁of ▁the ▁Y ar uba ▁had ▁been ▁elected ▁Im am ▁in ▁ 1 7 4 3 , ▁and ▁retained ▁the ▁support ▁of ▁some ▁of ▁the ▁Gh af iri ▁of ▁D h ah