I did the maths, and it would take about 400 people to get enough iron to forge a longsword

U know in games and stuff when you hear of a sword "forged from the blood of ur enemy", well I worked it out - and if you drained 400 adult men of their blood and extracted the iron, you'd have enough for a sword literally forged from the blood of your enemies 
how did you get this number? 

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