 As a response to this raid, the focus of the Ming's northern defences shifted from the Xuan–Da region to the Jizhou and Changping Defence Commands (昌平鎮) where the breach took place.Later in the same year, the dry-stone walls of the Ji–Chang area were replaced by stone and mortar.These allowed the Chinese to build on steeper, more easily defended slopes and facilitated construction of features such as ramparts, crenelations, and peepholes.