Meantime Najm S̤ānī, having with him some 11,000 men, had started on his corrective mission against Bābur. When he reached the Khurāsān frontier, he heard of the defeat at Kul-i-malik and the flight to Ḥiṣār, gathered other troops from Harāt and elsewhere, and advanced to Balkh. He stayed there for 20 days with Bairām Beg, perhaps occupied, in part, by communications with the Shāh and Bābur. From the latter repeated request for help is said to have come; help was given, some sources say without the Shāh's permission. A rendezvous was fixed, Najm S̤ānī marched to Tīrmīẕ, there crossed the Amū and in Rajab (Sep.-Oct.) encamped near the Darband-i-ahanīn. On Bābur's approach through the Chak-chaq pass, he paid him the civility of going several miles out from his camp to give him honouring reception. Advancing thence for Bukhārā, the combined armies took Khuzār and moved on to Qarshī. This town Bābur wished to pass by, as it had been passed by on his previous march for Bukhārā; each time perhaps he wished to spare its people, formerly his subjects, whom he desired to rule again, and who are reputed to have been mostly his fellow Turks. Najm S̤ānī refused to pass on; he said Qarshī must be taken because it was `Ubaidu'l-lāh Khān's nest; in it was `Ubaid's uncle Shaikhīm Mīrzā; it was captured; the Aūzbeg garrison was put to the sword and, spite of Bābur's earnest entreaties, all the towns-people, 15,000 persons it is said, down to the "suckling and decrepit", were massacred. Amongst the victims was Banā'ī who happened to be within it. This action roused the utmost anger against Najm S̤ānī; it disgusted Bābur, not only through its merciless slaughter but because it made clear the disregard in which he was held by his magnificent fellow-general. From murdered Qarshī Najm S̤ānī advanced for Bukhārā. On getting within a few miles of it, he heard that an Aūzbeg force was approaching under Tīmūr and Abū-sa`īd, presumably from Samarkand therefore. He sent Bairām Beg to attack them; they drew off to the north and threw themselves into Ghaj-davān, the combined armies following them. This move placed Najm S̤ānī across the Zar-afshān, on the border of the desert with which the Aūzbegs were familiar, and with `Ubaid on his flank in Bukhārā. As to what followed the sources vary; they are brief; they differ less in statement of the same occurrence than in their choice of details to record; as Mr. Erskine observes their varying stories are not incompatible. Their widest difference is a statement of time but the two periods named, one a few days, the other four months, may not be meant to apply to the same event. Four months the siege is said to have lasted; this could not have been said if it had been a few days only. The siege seems to have been of some duration.