Cao Cao strangled Lu Bu in the White Gate Tower, and the red rabbit BMW was returned to Cao Cao. In order to protect Liu Bei's two wives, Guan Yu temporarily took refuge in Cao Cao, who cherished Guan Yu very much.
I also want to imitate Dong Zhuo's BMW for Heroes. After Guan Yu accepted Red Rabbit, he was in Cao Ying's heart and in the Han Dynasty's heart. Finally, he took Red Rabbit, bid farewell to Cao Cao and returned to Liu Bei.
Extended data:
Red Rabbit Horse, whose real name is "Red Rabbit" (big and red, fierce as a tiger), is the king of horses, which is very controllable by people. As a mount of Lu Bu, after Lu Bu's death, the Red Rabbit Horse was given to Guan Yu by Cao Cao.
Red hare is a BMW pony brought by Dong Zhuo from Xiliang. In order to win over the young general Lu Bu, Dong Zhuo gave him the horse. Lu Bu got the horse, killed the original owner Ding Yuan, and went to Dong Zhuo's door. Later, the horse followed Lu Bu and showed great power.
But in the White Gate Tower, because of Liu Bei's words, Cao Cao brutally killed Lu Bu, and the Red Rabbit BMW also went to Cao Cao. Perhaps it was a coincidence that Guan Yu took refuge in Cao Cao. Cao Cao generously gave the red hare to Guan Yu.
But Guan Yu is not Lu Bu after all. He accepted the red rabbit in order to find Liu Bei faster. Since then, Red Rabbit Horse and Dragon Crescent Moon Knife have become the representative images of Guan Yu.
Guan Yu defeated Maicheng and was killed by Wu Dong. The red hare was returned to Ma Zhong. But this time it no longer obediently followed the new owner, starved to death, and followed the old owner Guan Yu.
However, according to historical records, the red rabbit disappeared after Lu Bu's defeat. Did not become Guan Yu's mount. This can also prove that The Romance of the Three Kingdoms has fictional elements.
References:
Baidu encyclopedia-red rabbit horse