Battles are lost and won in a quarter of an hour.
3 seconds sound clip from the Waterloo (1970) movie soundboard.
You can hear this line at 01:09:37.765 in the Blu-ray version of the movie.
Quote context
[...]
- Sire, we need four hours. The ground is too soft. I cannot move my cannon.
- If I waited four hours, I would have lost the Battle of Austerlitz.
- Sire, I cannot answer for my cannon.
- If we could attack at 12, it would be better.
- Battles are lost and won in a quarter of an hour.
- As I am second-in-command, and in case anything should happen to you, what are your plans?
- Dramatic fellows, these French. Music and banners. Quite beautiful.
- You're a lucky fellow, aren't you? To see such a wonder in your first battle.
[...]