It is Romans against Persians while we stand by.
4 seconds sound clip from the The Fall of the Roman Empire (1964) movie soundboard.
You can hear this line at 02:13:31.620 in the Blu-ray version of the movie.
Quote context
[...]
- We have done more than that, Lucilla.
- We have joined with the Persians.
- What can we do? Join Livius?
- How would Commodus repay us except with torture and death.
- It is Romans against Persians while we stand by.
- If I die, Livius, know this... I have given orders to have Lucilla killed at once.
- The King is dead! The king is dead!
- No, Lucilla. I want you to live. I want you to live.
[...]