 Zang was able to convince him that the emperor would only permit independent states like Yan for as long as they were useful for suppressing others' rebellions; once the country was at peace, the imperial clan would begin dismantling them and executing their royal houses for treason, whether deserved or not.Zhang took this to heart and negotiated with the Xiongnu to "assist" Chen.Upon hearing this, Lu Wan initially planned to execute Zhang and his entire family for treason; Zhang, however, was able to return and explain himself, convincing his king that supporting Chen was in his family's own interest.