Asad was replaced by
Ashras ibn Abdallah al-Sulami (727–730). The new governor at first continued Asad's policy of conciliation, but then reversed it, leading to the outbreak of a full-scale rebellion in Transoxiana, which, coupled with renewed Türgesh attacks, reduced the Arab presence there to
Samarkand and its environs. Ashras was able to recover
Bukhara, but his successor,
Junayd ibn Abd al-Rahman al-Murri, presided over the disaster of the Battle of the Defile, which crippled the Khurasani army, in 731. By the time of Junayd's death in 734, the Muslim holdings in Transoxiana had been reduced to Bukhara and parts of Tokharistan. These military defeats, the long-held grievances against the Umayyad government, and the forcible requisition of food by Junayd during the famine of 733 led to the outbreak of a rebellion in early 734, led by al-Harith ibn Surayj. Harith's uprising involved both Arabs and native princes, especially from the hitherto loyal principalities of Tokharistan, and spread quickly, with the rebels capturing Balkh. The new governor,
Asim ibn Abdallah al-Hilali, managed to check Harith's advance on the capital,
Marw, and forced him to seek terms. Asim's position remained precarious, however, and he wrote to the Caliph, asking for the placement of Khurasan once again under the purview of Iraq, the appointment of a new governor and the substantial reinforcement of the province with
Syrian troops. Hisham accepted the recommendations, and instructed Khalid al-Qasri to send Asad once again as governor to Khurasan. Early in 735, Harith renewed his rebellion. This time, whether due to pressure from local sympathizers in Marw or as an expedient way to gain time for Asad to arrive, Asim agreed to a truce with Harith, promising also to support Harith's demands against the Caliph. In early 735 Asad arrived once more to take up the governorship of Khurasan, this time accompanied by 20,000 Syrian troops, according to the 11th-century historian
Gardizi. He imprisoned Asim for embezzling money and failing to campaign against the rebels, and immediately took the field himself. He soon gained the upper hand in a succession of victorious, if costly, battles with Harith's supporters. Asad's success was aided by his long-standing personal relations with the local Arab tribal leaders, as well as by the continuing
tribal rivalries: as a
Yamani fighting against the
Mudari Harith, he could count on the support of his fellow tribesmen; thus most of the
Rabi'ah, the traditional enemies of Harith's Tamim tribe, soon defected to him. Asad divided his forces, sending the
Kufan and Syrian troops under Abd al-Rahman ibn Na'yum towards
Marw Rudh, where Harith's main army was located, while he himself with the
Basrans and remaining Khurasanis marched on the fortresses of Amul and Zamm. The rebel forces at Amul surrendered and were pardoned, and the garrison of Balkh followed soon after. Harith abandoned Marw Rudh and retreated across the Oxus before Abd al-Rahman, finding refuge with the princes of Tokharistan. With their aid, he laid siege to the major crossing point over the Oxus at
Tirmidh. In the face of Harith's forces, Asad's troops could not cross the Oxus, but retreated to Balkh. The Tirmidh garrison, however, managed to defeat Harith, who retired eastwards to the mountains of
Badakhshan. Asad followed up this success by persuading the garrison of Zamm to surrender on promises of
amnesty and double pay. Asad then led an expedition to recover Samarkand, which had been lost in the aftermath of the Defile. He failed to take the city, and returned to Balkh after destroying the sluices of the city's irrigation canals. The next year, 736, Asad's forces cleared the mountains of Upper Tokharistan from the remnants of Harith's supporters. Many of the latter, including some of Harith's relatives, were blockaded in the fortress of Tabushkhan by Asad's commander
Juday al-Kirmani with 6,000 men, until they surrendered. According to
al-Tabari, 400 of the men were executed, and the other defenders, including women and children, were sold into slavery. The same year, Asad moved the capital of Khurasan to Balkh. This decision was influenced by several factors: Balkh was the traditional, pre-Islamic capital of Khurasan, and remained so in the eyes of the local population; it lay closer to Tokharistan, where Asad concentrated his military activities; and it was settled by reliable Syrians, removed from the factional politics of the Khurasani Arabs of Marw. At this time, Asad also captured and executed one of the leaders of the Khurasani
Hashimiyya movement, Ammar ibn Yazid, known as Khidash, by crucifixion. In 737, Asad again led his troops north of the Oxus in a retaliatory campaign against Khuttal, whose ruler had allied himself with both Harith and the Türgesh. While Asad captured a few fortresses and pillaged the land, the Khuttalan regent, Ibn al-Sa'iji, called for aid from the Türgesh ,
Suluk. The Türgesh army's arrival caught the Arab troops, widely dispersed while ravaging the countryside, by surprise, and precipitated a headlong flight across the Oxus. The Türgesh followed after them. In the Battle of the Baggage, they attacked and almost annihilated the Arab baggage train, which Asad had sent ahead. The timely arrival of Asad's main army saved the baggage train's remnants, before both sides settled for winter quarters. Ominously for the Arabs, the remained in Khurasan instead of retiring north, and Harith now emerged from hiding and joined him. Harith now counselled the to take advantage of the dispersal of the Arab army to its winter quarters, and to resume his advance. In early December the led the Türgesh army, 30,000 strong with contingents from virtually every native ruler of Transoxiana and Upper Tokharistan, south. They bypassed Balkh and marched into
Juzjan, hoping to raise the
Hephthalite princes of Lower Tokharistan in revolt as well. In this the Türgesh failed, as the king of Juzjan joined Asad, who was approaching with what forces he could muster. Asad's advance caught the and Harith off guard; Asad came upon them near Kharistan, where they were accompanied by only 4,000 men, the rest having scattered to plunder and forage. In the ensuing
Battle of Kharistan, Asad routed the Türgesh. Harith and the barely escaped and fled north over the Oxus. The Türgesh detachments south of the Oxus were largely destroyed piecemeal by Juday al-Kirmani, ending the threat to Khurasan. After his victory over the Türgesh, Asad sent an expedition against Badr Tarkhan, possibly a prince of
Bamiyan in Ghur, who had taken advantage of the turmoil of the previous year and captured Khuttal. The expedition was successful, and Khuttal returned to Arab rule. A short while later, in February 738, Asad died at
Balkh after a brief illness. Ja'far ibn Hanzala al-Bahrani succeeded him temporarily until, in July,
Nasr ibn Sayyar was named to the governorship. ==Legacy==