In 1938 Chiang Kai-Shek's nationalist opted to breach the dykes of the Yellow River to flood the area in front of the Japanese advance and thereby slow down their enemy and protect the the key city of Wuhan.
The loss of life in the flooding was terrible, as was the damage done to homes and agricultural production. The government knew very well that this would be the result; it was an act of desperation.
The Chinese government didn't publicly admit to deliberately breaching the dykes. But the American government (at least) were well aware of how it had happened.
Was the dyke breaching intended partly as a message to the Americans and overseas allies (and to Japan) that China was prepared to stay the course of the war, would pay any price, and would never submit to her enemies' terms? Something like Britain's sinking of the French fleet at Mers-el-Kebir?
Is there evidence Chiang and his group intended the flooding to act as a message?