Suppose The Great Wall of China is a series of fortifications made of stone, brick, tamped earth, wood, and other materials, generally built along an east-to-west line across the historical northern borders of China to protect the Chinese states and empires against the raids and invasions of nomadic groups from the Eurasian Steppe. Several walls were being built as early as the 7th century BC; these were later joined together and made bigger during the Qin Dynasty, continuing into the Ming Dynasty.
Can we infer that "The Great Wall of China was built to protect against attacks from the south."? Yes, no, or maybe?