In my latest Uesugi campaign (STW WE 1.02 ) I defended Shinano from Takeda, Imagawa and Hojo. They attacked almost every turn, but I managed a kill rate of at least 5:1, often a lot better. This depleted their forces while I built up mine, and when I got tired of Shinano defensive battles I steamrolled through Hojo, Takeda and Imagawa lands.