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Later in 407, Later Qin and Northern Wei agreed to peace—returning previously captured generals to each other. The Later Qin general Liu Bobo (who would later change his name to Helian Bobo), who was then in charge of Shuofang (朔方, in modern Ordos, Inner Mongolia), because his father Liu Weichen (劉衛辰) had been killed by Northern Wei forces in 391, became angry and declared a rebellion, establishing Xia. Liu Bobo used guerrilla tactics against Later Qin, wearing Later Qin's armies and cities down. From this point on, Later Qin began to decline.