Even though incendiary torpedoes were combustible in water, their destructive power was much weaker than that on land.
As for the 100,000 iron-armored demons that jumped into Weishui River, besides the first batch which suffered a loss and some were killed by centrifugal ballista on the warships of Taixia Country, most of the iron-armored demons directly dove deep in water when encountering dangers. Although this method was nothing ingenious, it reduced the loss of iron-armored demons greatly.
Almost 90,000 iron-armored demons finally arrived at the east bank of Weishui River. Taixia troop only reduced a bit more than 10% of the total amount of iron-armored demons in the river, which figure was much smaller than the loss of iron-armored demons on the west bank of Weishui River.