Hurin was able to kill so many trolls because he was the greatest warrior of the rece of men. Also, the trolls weren't trying to kill him but were in fact trying to capture him, which they succeeded in doing in the end. If they had tried to kill him, I think he wouldn't have killed so many but it is still a great feat to kill seventy trolls and manage to yell Day shall come again after each one.
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His sword was long his lance was keen
His shining helm afar was seen
The countless stars of heavens field
Were mirrored in his silver shield
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