My second post about self-sacrifice is about a little Iraqi girl who risked her life to save others (don't worry, there's a very happy ending.)
On a didactic note: this story shows the folly of consequentialism, an error propounded by some liberal theologians and explicitly condemned by the Holy Father in Veritatis Splendor. Consequentialism is the idea that you can only know if an action is truly good or bad according to the outcome of the action. But that's foolish because, since no one can know the ultimate outcome of any given action, there's no way you can accurately gauge its effect beforehand. Therefore, you should do good and hope that good comes of it.
As if to illustrate this principle, a small act of almsgiving led to a huge act of bravery. Seriously, read the story. I personally guarantee you won't regret it.