Securing a castle gatehouse during a surprise raid required a barrier that could seal the entrance in seconds, leading to the invention of the gravity-powered portcullis. This heavy grating of thick oak timber, reinforced with iron straps and fitted with sharp metal spikes at the bottom, slid vertically within grooved stone slots in the gatehouse walls. Unlike heavy wooden doors that had to be swung shut and barred manually, the portcullis was suspended from thick ropes connected to a quick-rele... moreSecuring a castle gatehouse during a surprise raid required a barrier that could seal the entrance in seconds, leading to the invention of the gravity-powered portcullis. This heavy grating of thick oak timber, reinforced with iron straps and fitted with sharp metal spikes at the bottom, slid vertically within grooved stone slots in the gatehouse walls. Unlike heavy wooden doors that had to be swung shut and barred manually, the portcullis was suspended from thick ropes connected to a quick-release lever in the winch room above. When an alarm sounded, pulling this lever allowed gravity to drop the multi-ton gate instantly, slamming the spiked shoes into the floor to seal the entryway and trap attackers in the gatehouse corridor.
