Treatise on Military Preparedness, Volume 92, Military Provisions, Defensive Equipment Styles I

Lu Jiao Mu Deer-horn Wood

A large, branching wooden defensive structure resembling a deer's antler, used as a barricade or obstacle in military defense.

Di Se Ground Impediment

A rectangular plot of ground filled with small, upward-pointing spikes or caltrops, designed to impede the movement of enemy infantry or cavalry.

A multi-pointed iron caltrop (crow's foot) with sharp spikes radiating from a central point, used to puncture the feet of soldiers or horses.