They've done it.
3 seconds sound clip from the Glory (1989) movie soundboard.
You can hear this line at 00:24:45 in the Blu-ray version of the movie.
Quote context
[...]
- And you would not know from the sound of it that this is an Army camp.
- They must have had to learn this from long hours of meaningless, and inhuman work.
- To set their minds free so quickly it gives them great energy.
- And there is no doubt that we will leave this state as fine a regiment as any that has marched.
- Any Negro taken in arms against the Confederacy will immediately be returned to a state of slavery.
- Any Negro taken in Federal uniform will be summarily put to death.
[...]