His brother Sun Ce conquered Southeastern China from 197 until his death in 200. Sun Quan was in charge at the age of 18. He continued to expand his empire and drew back the forces of Cao Cao in the "Battle at Red Cliffs" (along with Liu Bei). To have better opportunities against the north, he gave his Jing Province to Liu Bei so that he could create an empire on his own. Liu Bei conquered the other western territories from 211 to 214 and set his brother Guan Yu in charge of defending Jing.