The Fall of the Song Dynasty By mvlaxkeeper19 Jan 1, 1127 Jin army captures North Song capital of Kaifeng;Ends North Song Period: Jan 1, 1127 to Jan 1, 1279 Southern Song Jan 1, 1212 Song take back capitals after fall of Jin; ends Mongol alliance Jan 1, 1259 Möngke Khan leads campaign against Song; dies during Jan 1, 1261 Kublai Khan takesover assault on Song, gains foothold on southern banks of the Yangtze river Jan 1, 1262 Song assault Mongols as they retreat due to succesion problems and impending civil war Period: Jan 1, 1262 to Jan 1, 1265 Minor border skirmishes occur between Song and Mongols Jan 1, 1265 Kublai Khan wins major battle in Sichuan province Period: Jan 1, 1268 to Jan 1, 1273 Kublai Khan blockades Yanhtze river with Navy Jan 1, 1271 Kublai Khan officially declares start of the Yuan Dynasty Jan 1, 1275 Massive Song forces suffer defeat to Mongols Jan 1, 1276 Almost all of Song territories are captured by Yuan troops Period: Mar 2, 2022 to Jan 1, 1127 Northern Song Period: Mar 2, 2022 to Jan 1, 1126 Political corruption and invading tribes weakening Northern Song