From Mental Floss: at http://www.mentalfloss.com/article/56852/5-diy-projects-defend-your-home-invaders. . . . .
In Defending Your Castle: Build Catapults, Crossbows, Moats, Bulletproof Shields, and more Defensive Devices, William Gurstelle poses the question: Using modern materials and construction techniques, could you successfully defend your home from history's greatest invaders? Gurstelle created 12 step-by-step DIY projects based on ancient artillery, and we've got five for you here.