Definition
A cheval-de-frise is a defensive obstacle made of a horizontal beam or bar studded with spikes or sharpened stakes. Imagine a medieval barrier designed to deter charging horses or infantry. It's like a physical 'keep out' sign for armies. Unlike a simple fence, it's specifically designed to inflict injury. The purpose is to create an impassable barrier, slowing down or stopping an enemy advance. Think of it as the historical equivalent of a modern-day road spike strip.