There'll be Injuns around that herd thicker than flies.
4 seconds sound clip from the She Wore a Yellow Ribbon movie soundboard.
You can hear this line at 00:34:21.611 in the Blu-ray version of the movie.
Quote context
[...]
- Sergeant Quincannon, escort the ladies forward, please.
- Why, Aunt Abby, that's really buffalo.
- Ah... That's a lot of buffalo. It reminds me of the old days. When whiskey was 50 cents a gallon.
- Sure hanker for a taste of buffalo meat.
- Me, too. Ain't never had none.
- Beans is safer, you mark my word.
- There'll be Injuns around that herd thicker than flies.
- What's your thinking, Sergeant? And don't tell me it ain't your department.
- Well, Captain, I ain't getting paid for thinking. I read it this way.
[...]