當(dāng)時(shí)正處秋雨時(shí)節(jié),漢水泛濫,關(guān)羽乘機(jī)率水軍進(jìn)攻,于禁歸降,關(guān)羽率軍圍困曹仁堅(jiān)守的樊城,關(guān)于采取圍點(diǎn)打援方針,關(guān)云長水淹七軍概括,