Biggest difference is that Shanhai fights a battle on multiple fronts. They never attack a place with only one direction. All the current war is so that they can attack chiyou from multiple directions and since its in the mountains is why all this nonsense. Otherwise they could use their nay and land to attack from multiple fronts. CHiyou basically invalidates their navy and also majority of a proper army. Fighting mountain tribes has always been a nightmare for any country.
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