Who Helps Aragorn kill large number of Orcs on bridge at
Helm's Deep?

I don’t know the answer I just need some points to ask more questions

Explanation:

(you didn't attach a copy of the poem, but i'm answering as best as i can)

since a simile compares two unlike things using like or as, it kind of gives an item the ability to do something it can't.

example: "the player was like a tiger on the field"

in this sentence, the simile conveys the idea that the player was fast and strong, like a tiger.