And send them marching under Philip on their holy mission to conquer Persia and destroy it.

9 seconds sound clip from the Alexander the Great (1956) movie soundboard.

You can hear this line at 00:14:57 in the Blu-ray version of the movie.

Quote context

[...]

- We sit here at the feet of Aristotle and learn of great wonders of science, of mathematics, of history and of logic.

- And maybe someday one of us will write a book and be known as the pupil of Aristotle!

- Aristotle, forgive me.

- For what? You spoke like a king. I, like a teacher.

- Your blood ran quick, too?

- At Cleitus' tale of the raid on Persians? Yes, it did.

- For in that act I saw something that might unite our torn and bloody land, and put an end to Greeks killing Greeks...

- And send them marching under Philip on their holy mission to conquer Persia and destroy it.

- Will Greece follow my father?

- I do not know. Neither does he.

- Men do not easily forget years of slaughter and burning and pillage, and deep and bitter hatreds.

- And the cry of Philip the Barbarian still echoes through the land.

- He may conquer, but he will not rule.

[...]