I'm not sure whether this would work or not, but along with bows and spikes, I would attempt using fire. Light some large arrows on fire and shoot them at the troll. Now, perhaps a troll's skin is not vulnerable to fire, but I suppose it would be worth a try.
Poor trolls! I can't help but be sorry for them. Mostly, they are merely dumb muscle creatures that Sauron decided to use in his war against Middle Earth, like Oliphants. They really don't have intelligence enough to protest.
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