Goryeo was a major concern for Sui Dynasty , so after Sui Emperor Yang ascended the throne, he fought three wars against Goguryeo .
However, the war that the Sui Dynasty devoted all its national strength to launch not only failed to destroy Goguryeo, but instead dragged itself down. Why is this?
first, improper command, Emperor Yang of Sui personally fought. He is not a qualified commander in itself! For large legion combat, the command ability is limited!
Second, the three armies have not moved, food and grass will come first! Emperor Yang of Sui went on an expedition to Goryeo, and he often had a million troops! The result is that the logistics is seriously overloaded and the supply line is too long.
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3, internal unstable and people's hearts are unstable. But Emperor Yang of Sui was very happy with his achievements. He built Grand Canal , built Granary, and paraded around. The abuse of people's power had reached its limit. Before Emperor Yang of Sui sent troops to Goguryeo for the third time, there was already wars everywhere in the country.
Sui Yang expeditions three times, lasting for nearly 4 years, placing four or five million manpower. The Sui Dynasty did not achieve the purpose of stabilizing the Northeast and eliminating Goguryeo. Instead, it intensified domestic conflicts and induced a storm-like peasant uprising war.
Only more than two years later, the rule of the Sui Dynasty completely collapsed. Three years later, Yang Guang's imperial guards rebelled, and Yang Guang, a generation of tyrants, was finally killed by his imperial guards.
