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Originally Posted by Belegorn
At least in BoLT it is mentioned how he used the enslaved Elves to build his machines.
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The Silmarillion, in
Of Túrin Turambar states:
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For few of the Noldor whom Morgoth captured were put to death, because of their skill in forging and in mining for metals and gems...
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I doubt Thranduil's people did that stuff, but they could once have had trade with Dwarves of Erebor, the Iron Hills, or even long ago Moria, and still had arrow points and such stockpiled. After all, arrows can usually be retrieved.