From
毛泽东's April 1949 poem
《七律·人民解放军占领南京》 (Seven-Character Regulated Verse: The PLA Occupies Nanjing). Full couplet:
钟山风雨起苍黄,百万雄师过大江。虎踞龙盘今胜昔,天翻地覆慨而慷. Written as Communist forces crossed the Yangtze and took the Nationalist capital, marking the effective end of the civil war.