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In February or March 258, Wen Qin told Zhuge Dan, "Jiang Ban and Jiao Yi left because we didn't follow their idea to attack the enemy. Quan Duan and Quan Yi have defected too. The enemy must have lowered their guard. Now is the time to attack them." Zhuge Dan agreed, so he, Wen Qin and Tang Zi led their troops out to attack and attempt to break out of the siege.