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
rike kogin kusa da kauyen Huayuankou a Henan, haddasa abin da aka kira da Canadian tarihi, Diana Lary, a "yakin-induced 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.