Count the mules.
4 seconds sound clip from the The Train Robbers movie soundboard.
You can hear this line at 00:26:58 in the Blu-ray version of the movie.
Quote context
[...]
- We went up that hill with him, too.
- You were the last man on guard.
- And packed itself and walked away.
- They led him off, then rode off with him.
- Four of them I could make out.
- Let Sam and me go after them. We can get that dynamite back.
[...]