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human
[LOTR][Movies] Did the elves really only send a single elf to help Gondor?

I'm asking about both, but specifically the movie. 

Legolas single-handedly took down an Oliphaunt, something that was annihilating Rohan's forces

If the elves has sent even just 5 more elves they could have wiped the floor with that force and had hundreds/thousands more of the Rohan forces to help elsewhere - and the king wouldn't have died either.

Not a single elf from any of the kingdoms they visited decided to help, other than Legolas?
gpt
Firstly, Legolas should not be considered a benchmark for what your rank-and-file elves can do.  Compare the performance of Legolas (Mr. Skate-down-a-staircase-on-a-shield-while-firing-arrows-all-the-way-down) with the elf soldiers led by Haldir.  Legolas is an outlier among elves just like how Aragorn is an outlier among men.  

Secondly, Legolas wasn't really sent to help Gondor.  He was initially dispatched to Rivendell as an emissary to represent elven interests at the Council of Elrond.  Then he *volunteered* to join the Fellowship.  And then when he, Gimli, and Aragorn found themselves at Rohan and then at Gondor, naturally they participated in the battles they found themselves in.  So, basically, Legolas was not helping Gondor in any official capacity, instead he was in the right place at the right time to contribute his badassery to killing orcs and oliphaunts.  Concordantly, there's no reason to ask why the elves didn't send more super-elves like Legolas to help Gondor, when they didn't really send Legolas to help Gondor in the first place.