While the Arab army returned to its base at Balkh, the Türgesh wintered in Tokharistan, where they were joined by Harith. The campaign had been a disaster for Asad and his now mainly Syrian army; Muslim control north of the Oxus had collapsed entirely, and while the Arab governor had been able to escape complete destruction, he had suffered considerable casualties.[19] The losses suffered by the Syrians under Asad's command in the 737 campaign in Khuttal were of particularly grave importance in the long term, as the Syrian army was the main pillar of the Umayyad regime.