 Si Kefa engaged in repeated raiding on neighboring chieftainships and in 1348-49 the Yuan court sent an expedition under Marshall Dashibadu to put an end to it.The expedition failed to subdue him, but Si did send his son Mansa to the Yuan court to offer allegiance.The "Baiyi Zhuan" reports that while Mansa "accepted the Court's calendar and offered tribute, his clothing, paraphernalia and system remained like those of a king."