In the first month of 1645, Dodo conquered Tong Pass and Xi'an, and in the second month he attacked the Southern Ming dynasty (remnants of the fallen Ming dynasty). In the fourth month, Dodo captured the city of Yangzhou and executed its defending official Shi Kefa, after which he ordered the Yangzhou massacre. By the following month, Dodo's army had crossed the Yangtze River and occupied the Southern Ming capital Nanjing and captured the Southern Ming ruler, the Hongguang Emperor. In the sixth month, Dodo conquered Zhejiang and returned to Beijing, after which he received the title "Prince Deyu of the First Rank" (和碩德豫親王).