No, Romulus. This time you are wrong. It was not only to save you that Remus decided to attack Alba Longa. It was because your father, before he died, had told Remus something that roused his ambition.
13 seconds sound clip from the Duel of the Titans (Romulus and Remus) movie soundboard.
You can hear this line at 01:35:26.780 in the Blu-ray version of the movie.
Quote context
[...]
- You surprise me. You sound like a king.
- He's young. Every young man feels like a king.
- Do you intend to wait forever for the brother who has abandoned you?
- Remus wanted this undertaking. We must wait for him.
- He's my brother. I owe him my life.
- Beat me to death if you like. That won't change the truth.
- Where?
- On the hill over there. Hundreds of them.
- They're over there too, look!
- We're surrounded. We don't have a chance.
[...]