 In 645, Emperor Taizong personally led a campaign against Goguryeo by land and sea with 113,000 Tang troops plus an unspecified number of tribal auxiliaries.His noted army captured a number of Goguryeo border fortresses, including the potent Yodong (Liaodong) Fortress, which had repulsed Emperor Yang in 612 and 613.Arriving outside Ansi Fortress on July 18, Emperor Taizong prepared to meet an approaching relief army, said to number 150,000 men, in battle.