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I was wondering.....

Would Cast Iron make good medieval armor?

I ask because I would imagine that it would be cheaper and quicker to make, but I am no expert on such things.

Also...

Would Iron mantlets (manetlets) be able to protect soldiers from mid-19th century guns?
Could an infantry line use a row of wheeled mantlets to protect them from enemy fire, while firing from gun-ports?

Thanks
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