Wubei Zhi (Vol. 55)

Its construction uses sturdy wood to make a staff, rounded at the top and square at the bottom. Also, use sturdy wood to build two small wheels. Use wrought iron to forge a spear. A small double-barreled gun shuanglian chong is mounted on the staff to stab the enemy. Also, use wrought iron to make twelve blades, each weighing one catty. Use wrought iron wire as the warp and leather strips as the ties to weave them into six panels. Then, assemble them. When encountering an enemy, spread them open like an umbrella. Blades and arrows cannot enter. You may deploy any kind of firearm, bow, or crossbow. Men and horses cannot charge through. This is a secret device for defense against the enemy.