Over the range of hills, as far as I could see, crept a darkening hem... ever longer and broader, until the shadow spread across the entire slope, then downward, downward, uncannily swift.
14 seconds sound clip from the Leiningen Versus the Ants (1948) classic radio play.
You can hear this line at 00:10:40 in the radio play.
Quote context
[...]
- Remember, they don't have any ditches.
- They'll be all right as long as they don't get caught between the river and the ants.
- They can outrun the crawlers. But if they get trapped, it's either the ants or the crocodiles.
- Look! Look! Look over there on the horizon. There are your ants! Look at 'em!
- It was a sight I will never forget.
- And all the green herbage on the entire slope was being mowed as by a giant sickle...
- Leaving only the vast moving shadow, extending, deepening... and always moving nearer.
- We can't last against that. Look at them!
- Well, I... No! They haven't gotten to us yet... and they never will.
[...]