 Complete the following phrase:  Ma Dai is a character in the 14th-century historical novel Romance of the Three Kingdoms, which romanticises the historical events and figures of the late Eastern Han dynasty and Three Kingdoms period. In the novel, he follows Ma Teng to the capital on a summon from Cao Cao, and survives when Ma Teng and his sons are killed by Cao Caos men in a trap. He joins his cousin Ma Chao in the Battle of Tong Pass against Cao Cao, and accompanies Ma Chao when the latter is defeated and has to seek refuge under Zhang Lu of Hanzhong. He follows Ma Chao and comes to serve Liu Bei when his cousin defects to Liu Beis side during the 