Keep 'em upstream so they won't have to swim.
5 seconds sound clip from the The Cowboys (1972) movie soundboard.
You can hear this line at 00:59:15 in the Blu-ray version of the movie.
Quote context
[...]
- Burnin' daylight? All I see are stars.
- You'll see a lot more of 'em if you don't move it.
- Keep 'em upstream so they won't have to swim.
- Push 'em upstream, that's it. Good work. Head 'em upstream more.
- Hold 'em up in the canyon till they all get across.
- Come on.
[...]