《史记·三十世家·吴太伯世家》
十年春，越王听说吴王兵驻郢都，国内空虚，举兵伐吴。
十年春，越闻吴王之在郢，国空，乃伐吴。
In the spring of the tenth year, the King of Yue heard that the King of Wu had stationed his troops in Yingdu, leaving the country undefended, and he raised an army to attack Wu.