After Cheng I died suddenly in Vietnam in 1807, his widow Ching Shih acted quickly to solidify the partnership with her step-son Cheung Po Tsai.

The new naval leaders, Wang Delu and Qiu Lianggong, blockaded him into the port and attacked, sinking Cai Qian's ship and killing him.

In September and November 1809, Cheung Po Tsai's pirate fleet suffered a series of defeats inflicted by the Portuguese Navy at the Battle of the Tiger's Mouth.

On 20 April 1810 at Furongsha in Guangdong, Cheung Po Tsai formally delivered his fleet and weapons, which now numbered about 280 ships, 2,000 guns and over 25,000 men.

Cheung Po would make future formal visits to the Leal Senado of Macau to meet several of the Portuguese officers who present at the fighting, among them was Gonçalves Carocha.

After Cheung Po died at sea in 1822 at age 39, his widow moved the family to Macau and there she opened a gambling house[5] and was involved in the salt trade.