When I started to see video of ironworkers in Kyiv welding together these tri-beam tank defense systems, I had absolutely zero context or idea of how they'd be deployed to defend a population center in Ukraine.
Well, now I know!
A US Army Engineer School correspondence course on fortifications describes steel hedgehogs as “relatively lightweight for the obstacle effect they provide, and they are quickly installed or removed. They are designed to revolve under wheeled vehicles and puncture them or to belly up tracked vehicles.
