 Complete the following phrase:  Initially, Chinese troops were incorporated into the existing Manchu Banners. When Hong Taiji captured Yongping in 1629, a contingent of artillerymen surrendered to him. In 1631, these troops were organized into the so-called Old Han Army under the Chinese commander Tong Yangxing. These artillery units were used decisively to defeat Ming general Zu Dashous forces at the 