 In contrast, Vietnamese historiography emphasizes the Dai Viet military victories.The first invasion began in 1258 under the united Mongol Empire, as it looked for alternative paths to invade Song China.The Mongol general Uriyangkhadai was successful in capturing the Dai Viet capital Thang Long (modern-day Hanoi) before turning north in 1259 to invade the Song dynasty in modern-day Guangxi as part of a coordinated Mongol attack with armies attacking in Sichuan under Möngke Khan and other Mongol armies attacking in modern-day Shandong and Henan.