In 383, as Former Qin launched a major assault with intent to destroy Jin once and for all, Xie Xuan and his Beifu Force was sent to the frontline, reporting to the command of his uncle Xie Shi (謝石).
Xie Xuan sent a message to the Former Qin commanding general Fu Rong (Fu Jiān's brother) with a proposal -- to have Fu Rong order his troops to retreat slightly to allow the Jin forces across, so the armies could engage.