Rubuta ci gaba don wannan sakin layi - A ranar 9 ga Yuni, 1938, a lokacin Yaƙin Sino-Japan na biyu, sojojin Nationalist a ƙarƙashin Chiang Kai-shek sun karya dam ɗin da ke riƙe da kogin kusa da ƙauyen Huayuankou a Henan, wanda ya haifar da abin da masanin tarihin Kanada, Diana Lary, ya kira "bala'in da ya haifar da yaƙi". Manufar aikin ita ce ta dakatar da sojojin Japan masu zuwa ta hanyar bin dabarun "amfani da ruwa a matsayin madadin sojoji" ("yishui daibing"). Ambaliyar ruwa ta 1938
na wani yanki da aka rufe ya ɗauki rayukan wasu Sinawa 500,000 zuwa 900,000, tare da adadin sojojin Japan da ba a san adadinsu ba. Ambaliyar ruwa ta hana sojojin Japan daukar Zhengzhou, a kudancin Kogin Yellow, amma ba ta hana su cimma burin su na kama Wuhan ba, wanda shi ne kujerar gwamnatin kasar Sin na wucin gadi kuma yana kan Kogin Yangtze.