In the YouTube video Three Kingdoms - OverSimplified, we have this depiction of the Battle of Red Cliffs:
The video suggests the Battle of Red Cliffs (赤壁之战) takes place on the border between Cao Cao and Liu Bei's territories, with Cao Cao invading Liu Bei's territory. I was discussing this today with my iTalki teacher, and he seemed to think I was mistaken, and Cao Cao invaded Sun Qian's territory (like this Quora answer). Wikipedia indicates the precise site of the battle is hard to confirm, since the region's geography has changed shape over time.
Question: Did the Battle of Red Cliffs take place on the border between Cao Cao and Liu Bei's territories?
