The General's Revenge

My sister defied etiquette. She gave me 'The Art of War' and argued for me to be disguised as a man. Before I led troops to war, she said, 'Vera, serve the nation.' When I returned victorious, she was forced into the Imperial Harem and went mad. The Emperor offered me a drink, saying, 'Having a subject like you is my greatest fortune!' I drained the cup. I threw open the city gates, letting my troops into the Imperial City! I shouted, 'Soldiers, follow me to cleanse the emperor's court!'