How did the Chinese use their innovative technology to protect themselves from invasion?

Science in China has a long history and developed quite independently of Western science.Needham (1993) has researched widely on the development of science and technologies in China, the effect of culture, and the transference of these principles, unacknowledged, to the West.The Chinese contribution to Western science is particularly interesting because it serves as a center of controversy about the roots of Western science.
According to traditional Western scientists, the roots of science and the scientific method is in Greece and Greek thought.There is a tendency among scientists to claim that not only modern science, but science in general, was characteristic of European thought.The accompanying argument in that all scientific contributions from non-European civilizations were technology-based, not science-based (Needham, 1993).