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'Swordbreaker' parrying dagger for catching and binding enemy swords, Italy, ~1600 AD
(media.kbin.social)
Just a magazine for everyone to share artifacts and replicas for the historically-inclined to admire!
These are used all the way up to broadswords. You use them to entangle and then wrench the blade away from your opponent. A lot of times they’re used with a cudgel in the other hand, not a sword.
Oh agreed that various sword breakers exist (ed) this particular one is designed for dealing with narrow stabbing blades. A broad sword, or similar would simply overwhelm it. This is a mugger's weapon, designed to deal with a "gentleman" sword, not a war sword.