Regarding Su Jingyue's points of confusion, Su Jingchen, as a brother, was quite willing to enlighten him.
"The terrain over in Great Meng Country is easy to defend but hard to attack. It's feasible for them to send small detachments to harass the border and occasionally steal some things back, but the idea of them annexing our Great Liang is impossible.
For the past hundred years, whenever we've struck Great Meng Country hard, they would voluntarily seek peace, sending tributes or a Princess over. But just let them recover for a few years, and they would come to harass our borders again. However, currently, we can only drive them away and can't completely annihilate them, nor dare to pursue them across the river to fight.
I heard decades ago, there was a Southern General who went mad with the intent to level Great Meng Country, chased them over the mountain, and less than a third of his troops returned.
