 Complete the following phrase:  Takasugi played a major role in this civil war and his former Kiheitai militia proved its superiority over old-fashioned samurai forces. With a series of quick strikes and the support of Katsura Kogorō, Takasugi achieved victory by March 1865. He became one of the main arbiters of the Chōshū domains policy and continued to act as the domains expert on Western military science, devoting his efforts to importing arms and raising troops. These reforms proved to be successful when Chōshū was victorious on four fronts against the Bakufus 