- You couldn't do that, eh?
- No, I couldn't.

3 seconds sound clip from the The Alamo (1960) movie soundboard.

You can hear this line at 00:18:32.416 in the Blu-ray version of the movie.

Quote context

[...]

- Even allowing for a Charro's exaggeration, Santa Anna must have crossed the Baja in strength.

- But I had to do it, Dick.

- I'd say we have two or at best three days before we see his banners.

- The men were listening.

- And I can't let that rabble know how weak we are and how strong the enemy is.

- You couldn't do that, eh?

- No, I couldn't.

- My honest and truthful and plain-spoken friend.

- You could, perhaps, but I couldn't.

- Now, take a look at this. This oblique rampart here...

- Well, have sense, Dick!

[...]