Well, I'm sure they'll do just fine.
4 seconds sound clip from the Glory (1989) movie soundboard.
You can hear this line at 01:04:10 in the Blu-ray version of the movie.
Quote context
[...]
- I know and admire your parents.
- You do, sir? Why, thank you, sir.
- Shaw, meet Colonel Montgomery. He's your brigade commander.
- Colonel Montgomery's a real jayhawker from Kansas. Contraband regiment is his brainchild.
- You didn't think yours were the only coloureds around, did you, colonel?
- Well, I'm sure they'll do just fine.
- Have they seen any mischief?
- No, sir.
- That is, if you think your men are up to it.
- Good. Very good. A pleasure.
- Beg to report, colonel, sir. The troop is fed and bedded down for the night, sir.
[...]