In 612, Emperor Yang mobilized a huge force said to number over a million men and invaded Goguryeo. Unable to overcome the defenses of Yodong (Liaodong) Fortress, Emperor Yang ordered 305,000 troops to attack the Goguryeo capital of Pyongyang. However, General Eulji Mundeok baited the Sui troops and annihilated them at the Battle of Salsu; according to Chinese historical records: of the 305,000 Sui troops, a mere 2,700 returned. Emperor Yang lifted his siege of the Korean fortress and withdrew his forces back to China.