And at the up-river entrance to the ditch, Leiningen had constructed a dam by which river water could be diverted into the ditch.
8 seconds sound clip from the Leiningen Versus the Ants (1948) classic radio play.
You can hear this line at 00:08:21 in the radio play.
Quote context
[...]
- Yes, I'll want to see the defenses.
- And the ants. We'll be a getting a glimpse of 'em before long, I should think.
- The defenses Leiningen had devised were quite impressive.
- Surrounding three sides of the plantation like a huge horseshoe was a ditch, twelve feet wide.
- For, as we now approached the ditch and rode along it, I could see that it was nearly full.
- How do you like my first line of defense, Commissioner?
- It's... reassuring, like a moat around a castle.
- Unless the ants know how to build rafts, they won't reach the plantation.
- This is only the outer moat. There's a better one than this.
[...]