Legrange was an Alliance vice admiral and commander of the 11th Fleet.
He participated in the National Salvation Military Council's coup d'état against the Alliance government, and shortly afterwards led the 11th Fleet in battle against the forces of Yang Wen-li, who fought for the restoration of the previous government. The 11th Fleet was little match for Yang, and, realising that the battle was lost, Legrange committed suicide.

(Source: Gineipaedia)