Since ancient times, loyalty has been a rare commodity. Therefore, when ancient soldiers went to war, those in power would typically take the families of the commanders into their custody, claiming it would allow the commanders to concentrate on fighting without any worries. In reality, it served as a warning to the commanders that if they dared to betray, they might survive, but their families would be annihilated without exception.
Even the famed general Li Ling could not avoid surrendering to the Xiongnu due to desperation, resulting in the death of his entire family.
Yang Yao, whether intentionally or unintentionally, gathered the families of his brothers in the water fortress, hitting everyone's most vulnerable spot!
