Bu Cheng (布城)

Ming Chinese Decoy Fortification
Drawing of a Bu Cheng (highlighted), from 'Ji Xiao Xin Shu (《紀效新書》)'.
Bu Cheng (布城, lit. 'Cloth fortress') is a defensive cloth wall designed by Ming general Qi Ji Guang (戚繼光). It is intended as the substitute of wagon fort tactic in South China, as the muddy terrain of South China makes ordinary war wagons unfeasible.

While nothing more than two sheets of brick-textured clothes supported by four wooden poles, Bu Cheng is nevertheless an effective tool, as it can be deployed within minutes at practically everywhere, even before the enemy's eye. Bu Cheng does not protect those behind it directly, but conceals their position and serves as an obstacle. It can also serves as dummy camp when deployed alone.

To prevent enemy troops from tearing it down, Bu Cheng is always deployed together with cheval de frise and caltrop. It can be reinforced with cotton blanket to defend against arquebus rounds. A combination of reinforced Bu Cheng, chevaux de frise and caltrops can quickly turn a vulnerable position into a well-defended field fortification. It is particularly useful to fortify artillery emplacement.

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