The details of the campaign are not authentically recorded. Zhao Tuo's early setbacks and eventual victory against King An Dương were mentioned in "Records of the Outer Territories of the Jiao province". Records of the Grand Historian mentioned neither King An Duong nor Zhao Tuo's military conquest of Âu Lạc; just that after Empress Lü's death (180 BCE), Zhao Tuo used his own troops to menace and used wealth to bribe the Minyue, the Western Ou, and the Luo into submission. However, the campaign inspired a legend whose theme is the transfer of the turtle claw-triggered crossbow from King An Duong to Zhao Tuo. According to this legend, ownership of the crossbow conferred the political power:“He who is able to hold this crossbow rules the realm; he who is not able to hold this crossbow will perish.”