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Apparently they also used hooks and bear traps attached to chains that lead down very tiny holes that had huge weights and boulders that would pull the mongols down into tiny non-visible holes at lightning-speed. Big enough weights to drag horses down too. The bear trap would activate and then a string would pull thus releasing the boulder. So often mongols would just suddenly disappear.
They couldn’t fight it once they got hooked on and often there were large areas with the hook and bear traps. So hundreds of mongols would suddenly disappear if riding with their boots stuck in their stirrups dragged with the horse or walking carelessly. The Croats also hanged these pulley traps in trees. Pulling mongols high up to hang or even flinging them in the air like a catapult.
Extensive writings were written on what happened and China has released the writings for their government edition history textbooks.