This is the best way for a regular army to deal with an Inborn Grandmaster's sudden attack.
But the problem is,
do those small barbarian states have this ability?
Their total army isn't more than a few thousand, at most ten or twenty thousand, and a large number of them are temporarily conscripted militia with limited strength and courage.
It's simply unrealistic to expect them to fearlessly charge at an Inborn Grandmaster who is like a divine demon.
Besides, it's a question whether these small countries can gather several top experts to hold back the Inborn Grandmasters.
With this huge gap in strength, the small barbarian states in the Heichi region are basically unable to stop the Song army led by Xie Ning.
They simply can't stop the Song army.
"So now it's interesting."