"Ahh yes," thought Bowleggs Blackadder. "Things are going well."
Several days earlier they had struck the earth at a promising spot, and already the fortress was beginning to take shape.
Particularly fortuitous was a small valley, which would be easily fortifiable with a little earth-work, and provide an excellent space for above ground farming.
Blackadder was inspecting the newly constructed booze still, with a gleam in his eye, when one particularly gormless moron approached.
"Milord.. milord..." said Urist McBaldric.
"What is it?" Replied Blackadder.
"I have a cunning plan!"
"Oh here we go."
"No, no, this is a _really_ cunning plan milord."
"Well, out with it."
"Did you notice that our construction is butting up against a gorge with a river at the bottom? Well, we could make a bridge across that into our main base. Any time a raid happens, well, we just raise up the bridge, and no problem."
"McBaldric, I think you have forgotten one small thing. That river is swarming with bloodthirsty carp, which would eat anybody who got close to it."
"Ahh yes. Not to worry milord, I've thought of that. The surface of the river is a good twelve feet below where we would cast the bridge. I don't think carp can jump _that_ high! And also, suppose we let some gobbos or trolls come knocking on our gate at the end of the bridge. We could retract it and let them drop down into the evil swimmy things!"
"Hmmm.. Actually.... thats not a bad idea! Very well. Build this bridge!"
......
I'm thinking you guys can guess what happened next.