On September 17, Anderson's Division was ordered into the ongoing battle around 9:00 am, taking up position in the center of the Confederate line, along a sunken road. Because Mahone's Brigade had taken heavy casualties at Crampton's Gap, it was appended to the brigade of Roger A. Pryor. The road became the center of a series of bloody Union attacks for the rest of the morning, and when Anderson was wounded, Pryor left to take lead the division. The four men commanding the brigade following his departure were all killed or wounded, and the fight degenerated into chaos.