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Also in 407, Liu Bobo sought marriage with a daughter of the Southern Liang prince Tufa Rutan, but Tufa Rutan refused. In anger, Liu Bobo launched a punitive raid against Southern Liang but then retreated. Tufa Rutan gave chase and, believing that he greatly outpowered Liu Bobo, was careless in his military actions. Liu Bobo led him into a canyon and then blocked the exit with ice and wagons, and then ambushed him—and the defeat was such that it was said that 60% to 70% of Southern Liang's famed officials and generals died in the battle. Tufa Rutan barely escaped capture.