"If the enemy really broke through Zhennan Pass, we just need to make the walls thicker."
Yes, because that's what you do when an enemy is a week or two away from your city. Launch a several-month-long project to make your walls thicker.
Gave away thousands of gold, gave away the salt pans to Beihai, going to build a huge-super expensive wall (if ehe enemy reach the wall, it will be useless), and still mumbling about not having enough gold for the auction.
I am starting to admire Di Chen.
Mythfury