sentences:  () until 1683, to weaken their economy so cut off all the connection of trade with Tungning Kingdom.By 1683, Kangxi Emperor had stopped all attempts at negotiation with Tungning.Yao Qisheng also recommended Shi Lang as the commander-in-chief of the Qing navy, then Kangxi Emperor agreed and sent Admiral Shi Lang with a force of about 21,000 men and 240 warships to invade Tungning.