Greatest Man of Middle-Earth??

[obloquy]

Last of all Húrin stood alone. Then he cast aside his shield, and wielded an axe two-handed; and it is sung that the axe smoked in the black blood of the troll-guard of Gothmog until it withered, and each time that he slew Húrin cried: 'Aurë entuluva! Day shall come again!' Seventy times he uttered that cry; but they took him at last alive, by the command of Morgoth, for the Orcs grappled him with their hands, which clung to him still though he hewed off their arms; and ever their numbers were renewed, until at last he fell buried beneath them. Then Gothmog bound him and dragged him to Angband with mockery.

We can't say for certain that every time Húrin 'slew' he was slaying a troll, however we may take his battlecry ('Day shall come again!') as a reference to the troll's notorious intolerance for sunlight, and a prayer for dawn. In any case, he withered the troll-guard of Gothmog, who was also present but evidently unable to take Húrin by himself.