What was being done to protect industry and the people from invasion and rebellion?

"We call it a security system that protects the house from termite invasion," he said.

She was among those given the duty of protecting the solar system from outside invasion.

So they gathered together and pondered ways to protect themselves from invasion.

This nobility organized warriors to protect the society from invasion.

"I want to see Korea protected from invasion as much as you!"

"Somebody's got to stay home to protect the state from invasion."

Their technology is not at the stage where they are able to protect themselves from invasion before the incoming force lands on the surface.

But doesn't it protect us from invasion by the Mundanes?

Our task is to protect this town site from invasion.