Battle of Wuzhang Plains

The Battle of Wu Zhang Plains was a critical battle fought in 234 A.D. between the forces of Shu lead initially by Zhuge Liang and later by Jiang Wei against the forces of Wei lead by Sima Yi. During the campaign, Zhuge Liang's health started to fail, so he attempted to lure Sima Yi out with insults, but Sima Yi stood resoutly, and Zhuge Liang soon became ill and passed away, leaving command to Jiang Wei, who ordered the army's withdrawl. Sima Yi sensed Zhuge Liang's passing, and launched an offensive, but Shu responded ferociously, lead by a wooden dummy dressed up to resemble Zhuge Liang, causing a frightened Sima Yi to pull back and allow Shu's troops to withdraw. Although Jiang Wei continued to fight for Shu after the battle, it is the end of the timeline in the games, with either Wei or Shu winning decisively and taking control of the land. In Dynasty Warriors 5 Knwoledge Base, it says that neither won, they both lost. If this were to be true, that means both teams had forfeit?