Analysis of information sources in references of the Wikipedia article "Ningbo" in English language version.
Thereafter they made the factory near Ningbo their chief trading outlet. In the late 1540s, there were more than 3,000 people there, some 1,200 of them Portuguese. From this base, the latter raided neighboring coastal cities, pillaging and taking people into slavery. The Chinese authorities responded with armed expeditions against them and, finally, the Portuguese had to abandon the factory
