How to use "hero" in a sentence

I was a war hero, you know - I saved an officer's life at Waterloo! And you call me a criminal! Well, I'm going to teach you a lesson.'

'The man was a hero,' Marius said

'But he's a splendid man! The fortune was really his, and he's not a murderer or thief at all! He's a hero and a saint!'

And a police officer helps him to stand and says something about him being a hero.

Dombey, who clearly did not share his associate's compulsion to play hero, remained docile in his chair