They were dropping shreds of bark and twigs and leaves into the petrol-filled ditches forming a floating bridge across the surface of the liquid.
8 seconds sound clip from the Leiningen Versus the Ants (1948) classic radio play.
You can hear this line at 00:20:03 in the radio play.
Quote context
[...]
- Senor! Senor! A few of the ants have reached the ditch!
- They're trying to get across?
- Leiningen stood silently watching this operation and I could see a grudging admiration in his face.
- Then, after several hours, the attack came.
- Leiningen sat motionless, watching them - watching them...
- Leiningen, for the love of God, don't sit there like a statue! They'll be on us in a moment!
[...]