I think Arash has got the concept of what an idiom is, but is looking for the actual idiom.

I have no clue, the only one I can think of is 'to make a mountain out of a mole hill', but that doesn't address the heroic nature.


Here are a couple of sites that list a ton of idioms, good luck:

http://www.eslcafe.com/idioms/id-list.html

http://www.idiomsite.com/

http://www.geocities.com/Athens/Aegean/6720/