Kammala wannan jumla: A ranar 9 ga watan Yunin 1938, a lokacin yakin Sino-Japan na biyu, sojojin kasa karkashin Chiang Kai-shek
ya karya dam da ke riƙe da kogin kusa da ƙauyen Huayuankou a Henan, yana haifar da abin da masanin tarihin Kanada, Diana Lary, ya kira "bala'in bala'i". 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 ruwan da ta rufe wani yanki a shekara ta 1938 ta kashe wasu Sinawa 500,000 zuwa 900,000, tare da 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.