I believe Horace means that Greece won freedom from the Romans and somewhat ruled them. Like you said, Greek architecture, art and science merged with Roman knowledge. Furthermore, Greeks controlled the Roman Senate.
I think you're trying to see the "fight" from both sides. You can't. For this assignment, you have to write from the perspective of Greeks being victorious.
India had ceased importing opium
During the age of imperialism, Britain used opium to forcefully open china to trade.
They fought with the confederates. Because of the hate of many poor whites.