Wang Shuwen and his associates were almost immediately purged. While Du was serving as the director of finances, he reorganized the financial matters and returned a number of responsibilities that the director of finances had undertaken to other agencies which had previously had those responsibilities. When Emperor Shunzong died in 806, Du again briefly served as regent for several days. Later in 806, Du requested that he be relieved from his financial responsibilities and recommended his deputy Li Sun (李巽, who had replaced Wang Shuwen at Du's recommendation) as his replacement. Also in 806, he was made, in addition to chancellor, Situ (司徒, also one of the Three Excellencies) and created the Duke of Qi. As Du was old at that time, Emperor Xianzong afforded him great respect, referring to him only as Situ and not by name. When Du requested retirement due to old age in 807, Emperor Xianzong had him keep all of his offices but be allowed to go into semi-retirement at his mansion in Fanchuan (樊川, near Chang'an), only to visit the office of the chancellors two or three times a month to discuss important matters of state. Fanchuan was scenic, and Du often invited the other officials to feasts there. Around that time, Dangxiang tribesmen often served as guides for Tufan forces in attacking Tang territory, and there were many suggestions by officials to attack Dangxiang tribes. Du submitted a petition advising against attacking Dangxiang, reasoning that the better strategy is to treat Dangxiang tribes with kindness to get them to submit. Emperor Xianzong appreciated the suggestions. In 812, when Du fell ill, he again requested retirement, and this time Emperor Xianzong approved. Du died later in the year and was given great posthumous honors. His grandson Du Cong later served as a chancellor during the reigns of Emperor Wuzong and Emperor Yizong; another grandson, Du Mu, was a famed poet of the late Tang period. It was said that Du was diligent and studious, and even when he reached the apex of governmental service, he continued to study earnestly. Whenever he discussed policies with his staff members, they were impressed by his logical reasoning and knowledge. It was said that his acts were almost without fault, except that his reputation suffered when, during his service as military governor of Huainan, his wife Lady Liang died, and he promoted a concubine, Lady Li, to be