北魏太武帝拓跋焘是位励精图治、奋发有为的君主，北魏的疆土在他手里广为开拓，与当时南朝等四邻的关系也处理得较为主动，国内政治也算清明，聚拢了一批能臣良将。然而在位日久，拓跋氏也生出些骄逸之心。《资治通鉴》第一百二十四卷就记载了这么一件事：公元四四四年八月， Northern Wei Dynasty too Tuoba Tuoba is a good man, energetic monarch, the Northern Wei territory in his wide open, and then the four neighbors such as the relationship between the South also dealt with relatively more active, domestic politics can be considered clear, gathered a group To Hill will be good. However, as a leader, Tuoba also gave birth to some arrogant heart. One Hundred and Twenty-Fourth Volume of the Book of Sufferings records such an event: in August four four four,