建安二十四年(公元219年),关羽发动襄樊战役,虽然水淹七军,威震华夏,但最终却导致荆州失守,自身也为孙权所杀。但令人感到困惑的是,整个襄樊之战如此规模巨大的军事行动,蜀汉方面竟没有采取任何对策。最后当关羽败走麦城、全军覆没之际,蜀军援兵也还是迟迟不至。 Jian’an twenty-four years (AD 219), Guan Yu launched the battle of Xiangfan, although the flooded seven army, Megatron China, but eventually led to the fall of Jingzhou, Sun Quan himself killed. However, what is puzzling is that the war in Xiangfan was such a huge military operation that Shuhan side did not take any measures. Finally, when Guan Yu defeated the city of Mai, the army annihilated occasion, Shu army reinforcements is still not yet arrived.