Girl says if cockroach or bird went next to fence they knew.

How does it stop thousands of cockroaches and birds simultaneously flying into fence?

How does it reinforce any outposts overrun? Any outposts perhaps undermanned, and at dawn, on the Sabbath and holiday?

There is obvious logistical problems. Perhaps there was other failures. But where they were prepared, Israel wasn't. It goes without saying. Nothing is impossible if it's committed to beating the impossible.

Girl says if cockroach or bird went next to fence they knew.

How does it stop thousands of cockroaches and birds simultaneously flying into fence?