Wu Hu
Northern China was devastated by the Wu Hu uprisings. After the initial uprising, the various tribes fought among themselves in a chaotic era known as the Sixteen Kingdoms. Although brief unifications of the North, such as Later Zhao and Former Qin, occurred, these were relatively short-lived. During this era, the Northern armies, were mainly based around nomadic cavalry, but also employed Chinese as foot soldiers and siege personnel. This military system was rather improvising and ineffective, and the states established by the Wu Hu were mostly destroyed by the Jin Dynasty or the Xianbei.