That would be a very, very bad move on their part. I know of NO king who did not defend his castle. Historically, the gates were closed, the bridges raised, the moat filled with oil and archers knocked, scouts sent out to recon. Then lie in wait as the enemy approaches. Against all odds, I never read about a kings retreat outside the castle to evade an army larger than his own, I’ve never known a king to sneak out his back door! “For the safety of his people”! The don’t call it the “Castle Doctrine” for nothing.
Before they storm the castle they will prevent you from acquiring sustenance, their next stop will be to blockade your local grocery stores, the restaurant was just a test run. So after a hundred days without food, what is your answer to survival?
People, the bell has already been wrung. Their statement is clear, we are coming for you by whatever means necessary.