Si Jiuyue stood on the mountaintop, looking down at the Wooden Courtyard, feeling that she could not afford to let her guard down.
The wooden wall could keep out wild beasts, but if there were any military unrest, they would be in serious trouble. With a solemn expression, she pursed her lips, suddenly remembering the tunnel warfare from the war of resistance. She could easily dig a network of tunnels connecting the Wooden Courtyard to the wild hills, and under every household.
For one, they could hide underground to keep warm in the dead of winter. Second, if enemies approached, they could hide underground where they would be impossible to find. Third, food could be stored underground so it wouldn't be plundered.
Chapter 328