Suppose The Great Wall of China is a series of fortifications made of stone, brick, tamped earth, wood, and other materials. It was built along the northern borders of China to protect against invasions by nomadic tribes. Construction on the wall began as early as the 7th century BC, with later sections added during 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?