How do you suppose we heard those shots?
We must be at least a mile from the tank.
"Him fog," Injun answered.

"Hear plain." And it is true that fog has a way of conveying sound.
An idea brought Whitey to his feet with a leap.

"What fools we are to be sitting here!" he cried.

"We'll follow those robbers.

The people on the train won't do that.