The Tushan Clan returned to the seal, and its underground palace had collapsed the southwestern corner of the Capital City. Fortunately, there weren't many civilian residences in that area, so the casualties were minimal.
During the time when the Empress Dowager was trapped in the Tushan Underground Palace, the Capital City did not crumble, nor did Great Yu fall into chaos across the four seas. One reason was that it lasted only four or five days, and another was because the nameless old matron presided over the imperial palace, allowing the Chief of Staff's inner chamber to function as usual.