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Goguryeo in Korean history
Goguryeo War
The battle of Salsu
The battle of Salsu was an enormous battle that occurred in the year 612, during the second Goguryeo-Su War, between the Goguryeo and Chinese Su Dynasty. China’s Su Dynasty was waiting for the chance to attack Goguryeo. Finally Su launched series of attack commanding a large army under arms in 589. Su assailed the Yodong fortress and Pyongyang castle consecutively, but failed. Even though the number of the Goguryeo army was relatively smaller than the Su, it overwhelmed the Chinese troops in combat. On their way back, Su army reached near the Salsu river. There was no ship on Salsu and the water level was shallow than usual. Su army started to cross the river without any suspicion. Beforehand, Eulji (Goguryeo general) had already selected Salsu as the decisive turning point and had cut off the flow of the water, storing it behind the dam. When the Su army half crossed the river, Eulji opened the dam. The Su army was swallowed up by the waves. The surviving Su forces were forced to retreat to Manchuria to avoid being killed, however only two thousand survived. The battle is one of the most lethal battles in world history.

The battle of Ansi
China's Dang dynasty learned from the past that its predecessor
Su fell before Goguryeo's mighty power, so Dang thought they
have to prepare before launching an attack on Goguryeo. Dang
dispatched an envoy to Goguryeo requesting not to invade Shilla,
but Goguryeo ignored. When King Taejong of Dang heard news of a
military blow in Goguryeo led by General Yeongaesomoon, he could
not have been happier, as the Chinese ruler was plotting ways to
justify vigorous attacking of Goguryeo. Now Dang could say that
its onslaught was to punish Yeongaesomoon for assassinating his
king and to rescue the Goguryeo people from the betrayer.
Meanwhile, Shilla played cardinal role in assisting Dang's
attempt to defeat Goguryeo. Finally in 645, China launched its
attack. The battle at Yodong castle marked the first major
defeat of Goguryeo. The Dang army eyes the Ansi fortress as the
next target following the battle at Yodong castle. The Invading
troops besieged the fortress. Inside the Ansi fortress, there
were only 100,000 Goguryeo soldiers and people ready for the
attack contrast to 500,000 Dang army. Meanwhile, Dang troops
besieged the fortress and started to pile mud and raise the hill
higher than the fortress. People inside the fortress were
intimidated. When the hill was almost height of the fortress,
Goguryeo’s well-trained soldiers sneaked out from the fortress
at midnight. They dig up each side of the mud hill. Few days
later, the construction lost control and collapsed under the
weight of the mud. The collapse turned out to be of help to
Goguryeo and changed the tide of the battle. Three months past
since the Dang army besieged the fortress, but Goguryeo army
were invincible. Fierce battle between Dang and Goguryeo
continued over 3 months. Rough weather outside the fortress was
hard to withstand and the situation got worse. Dang soldiers
were depressed by over their futile effort. At last, Dang army
decided to withdraw their troop.

General Eulji, Mundeok

▲ General Eulji, Mundeok lead Great war Salsu into victory in 6th century.
General Yeon, Gaesomun

▲ Yeon, Gaesomun defeated Tang's hundred of thousand troops sent by King Taizong succesfully.
