23 March 1661, Zheng's forces set sail from Kinmen (Quemoy) with a large fleet of 400 ships carrying around 25,000 soldiers and sailors aboard. They arrived at Penghu the next day and on 30 March, a small garrison was left at Penghu while the main body of the fleet arrived at Tayouan on 2 April. Zheng's forces routed 240 Dutch soldiers at Baxemboy Island in the Bay of Taiwan. They landed at the bay of Luermen. Three Dutch ships attacked the Chinese junks and destroyed several until their main warship, the Hector, exploded due to a cannon firing near its gunpowder supply. The remaining two ships consisted of a yacht and a lesser warship, which were unable to keep Zheng from controlling the waters around Taiwan. The landing forces defeated the Dutch. On 4 April, Fort Provintia surrendered to the Zheng forces. On 7 April, Zheng's army surrounded Fort Zeelandia and bombarded the fort with 28 cannons. An assault on the fort failed and many of Zheng's best soldiers died, after which Zheng decided to starve out the defenders. On 28 May, news of the siege reached Jakarta, and the company dispatched a fleet of 12 ships and 700 sailors to relieve the fort. The reinforcements met with bad weather and a shipwreck that had an entire crew captured by natives and sent to the Zheng camp. Fighting between the Dutch and Zheng ships lasted from July to October when the Dutch ultimately failed to relieve the siege after losing several ships. They retreated with two ships sunk, three smaller ships captured, and 130 casualties. In January 1662, a German sergeant named Hans Jurgen Radis defected and informed the Zheng forces of a weakness in the fort's defenses. On 12 January, Zheng's ships initiated a bombardment while the land forces prepared to assault. The Dutch surrendered. Frederick Coyett, the Dutch governor, negotiated a treaty, where the Dutch surrendered the fortress and left all the goods and property of the Company behind. In return, most Dutch officials, soldiers and civilians were allowed to leave with their personal belongings and supplies and return to Batavia (present-day Jakarta, Indonesia), ending 38 years of Dutch colonial rule on Taiwan. Zheng did, however, detain some Dutch "women, children, and priests" as prisoners. On 9 February the remaining company personnel in Fort Zeelandia left Taiwan. Zheng then proceeded on a tour of inspection to "see with