Is “At Changban Slope, he rode alone to rescue the young lord, charging into the enemy's ranks.” true?

The Records of the Three Kingdoms, Book of Shu, Biography of Zhao Yun records that he protected Lady Gan and Adou from danger at Changban Slope; the novel's account of his slaying over fifty Cao camp generals is fictional. The original text says, 「及先主为曹公所追于当阳长阪，弃妻子南走，云身抱弱子，即后主也，保护甘夫人，即后主母也，皆得免难。」（《Records of the Three Kingdoms, Book of Shu, Biographies of Guan, Zhang, Ma, Huang, and Zhao》）