Shi-whang-ti having obſerv’d in viſiting his Empire that the Northern Provinces, eſpecially Pe-che-li, Shan-ſi, and Shen-ſi, were much expoſed to the ſudden Incurſions of the Tartars ; he fent a formidable Army, which having driven them back a great way beyond the Frontiers of the Empire, he immediately put in Execution the Scheme he had form'd to ſecure his Country againſt ſuch dangerous Neighbours, by building a Wall from the Sea to the Extremities of the Province of Shen-ſi.]