In 430, Emperor Wen started a number of northern expeditions against Northern Wei. These were ineffective because of insufficient preparations and excessive micromanagement of his generals, increasingly weakening the dynasty. Because of his jealousy of Tan Daoji, a noted leader of the Army of the Northern Garrison, he deprived himself of a formidable general to the great delight of the Northern Wei. Thus, they were unable to capitalize when Northern Wei suffered the Wuqi Incident. Starting in 445, Northern Wei, taking advantage of Liu Song's weakness, made major incursions in the lands between the Yangtze and the Huai (modern Shandong, Hebei, and Henan) and devastating six provinces. Emperor Wen lamented that if Tan were still alive, he would have prevented Northern Wei advances. From then on, Liu Song was in a weakened state.