 The Zhenhai Coastal Battery was the site of the 1885 Battle of Zhenhai during the Sino-French War.In the later 19th century, Zhenhai was protected from the sea by a dike about long, made of large blocks of hewn granite.Zhenhai has suffered severe long-term air pollution mainly emanating from the Ningbo Petro-Chemical Economic and Technical Development Zone built on its eastern coast.