- The gun is ready, sir!
- Fire!

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

You can hear this line at 01:24:27.671 in the Blu-ray version of the movie.

Quote context

[...]

- Acting Lieutenant Finn is exaggerating.

- ¡Fuego!

(Mountain Howitzer Cannon Firing)

- She's a big one, Davy, and she's shooting from over here!

- Battery one! Is your gun ready?

- We're primed and ready, sir.

- Give it full elevation!

- Yes, sir!

- The gun is ready, sir!

- Fire!

- Kind of short there, Colonel Mr. Travis!

- I sure I'm glad I seen that there cannon sitting out there on that prairie. For a minute, I thought they was shooting at us from one of 'em old country's way over in Europe.

- Oh, my goodness. No! Oh, no! They wouldn't dare!

- Man, that ain't no fair way to fight a war!

[...]