Trollhammaren!

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Originally Posted by Groin Redbeard

Speaking of the 70 trolls killed by Hurin, could it be that Morgoth's trolls were smaller and similar to the ones in the fairy tails? I always thought of them that way. How could Huirn have killed 70 eighteen foot trolls?

Here's the quote from CoH:

"It is sung that the black axe smoked in the black blood of the troll guards... Seventy times he uttered that cry..."

Notice the "it is sung" and consider the fictional perspective. All the historywriters who recorded The Battle Of Unnumbered Tears knew was that the men led by Hurin were surrounded and finally slaughtered, quite possibly down to the very last man. But Hurin was bound, taken to Angband and tormented. When Morgoth released him much later he wouldn't have made up a boast story about how many trolls he slew the worst day in his life.

Still he was a hero for defying Morgoth and I think the (make-belive) historywriters probably used their creative freedom and filled out the blanks to make Hurin's last stand seem more valiant and glorious than it already was. It is more likely that when Gothmog and his troll guard arrived Hurin was quite overwhelmed and rather easily subdued and humiliated.