a campaign against Goguryeo; he did not bestow any monetary rewards on the garrison or its reinforcements; and he was sparing in the promotion of the officers involved. When Fan and Xiao Yu reminded him of the promises, Emperor Yang rebuked Fan and demoted Xiao Yu. Emperor Yang only appeared to begin to be concerned about rebels when, at the lunar new year imperial gathering in 616, 20 odd commanderies' messengers did not arrive—either because they had fallen into rebel hands, or because their messengers were intercepted or killed on the way. Only then did Emperor Yang begin talking about suppressing the rebels. Apparently beginning to consider the idea of evacuating to south of the Yangtze River, he ordered that a major palace be built at Piling Commandery (毗陵, roughly modern Changzhou, Jiangsu), and that another palace be built in Kuaiji Commandery. However, he did not like to hear news about rebels, and when Su expressed concerns about the rebels, Emperor Yang had Su falsely accused of crimes and initially was poised to execute him, but instead demoted him to commoner rank. By fall 616, Emperor Yang had resolved to go to Jiangdu, at Yuwen Shu's suggestion. A number of officials opposed, reasoning that if he left Luoyang, Luoyang would fall into enemy hands; Emperor Yang punished all, some with execution, and proceeded to Jiangdu. He wrote a farewell poem to the ladies in waiting in Luoyang, which included two lines that read: I dream of Jiangdu's beauty; And it was only occasional that I advance past the Liao River. Once Emperor Yang left Luoyang, Yang Xuangan's former strategist Li Mi, who by this point was advising the rebel general Zhai Rang, advised Zhai to directly assault the Luoyang region. Zhai agreed, and killed Zhang Xutuo in a battle; thereafter, the morale of the Sui troops became greatly damaged. Zhai, believing in the prophecies about the next emperor being a Li, began to honor Li Mi as his leader. Meanwhile, the Sui general Yang Yichen was having success against the rebels north of the Yellow River, killing Zhang Jincheng () and Gao Shida (), but Emperor Yang and his prime minister Yu Shiji, fearful of Yang Yichen's talent, ostensibly promoted Yang Yichen and recalled him to be a minister. Yang Yichen died soon thereafter, and the rebels north of the Yellow River reinvigorated themselves under Dou Jiande. By 617, several