I agree with Shaihulud, rout the bastards and set up shop a short distance from where the reinforcements pour in. Put Hth units on the flanks and have something frightening in front & full view. This said, there's still that damned province in Shimazu land, where the reinforcements cascade into a patch of forest and thus aren't frightened by your eager & intimidating blood letters until they emerge. By then, 2 more units have entered the woods, with more on the way. The name escapes me, but the province borders Nagato.