Problem with two stacks and a castle in a valley is that you usually can't get past the one outside the castle to siege it.
I tried pulling back in the hope that one of the two stacks would follow and be beatable separately but they wouldn't take the bait - and that gave them another two turns to add half a dozen or whatever new units.
What eventually happened is that a Honma stack fortuitously appeared to attack the Mogami and I followed it and when the Honma suicidally attacked and I had the opportunity to join the battle won an epic victory against a ridiculous 7,000 Mogami (two near full stacks of mostly yari ashigaru)
However with no cavalry other than a couple of much depleted general units I could make all the Mogami run away but could only kill a couple of thousand - and next turn I still had 5,000+ Mogami left in and outside the castle vs only a few hundred surviving Date (and the Honma stack had all died in the battle or just disappeared as AI stacks sometimes do).
While I think I am pretty good at SP battles I can't beat those odds so had to make the long trek back to my own territory to reinforce and regenerate my own army - and then hordes of Satake invaded from Miyagi and it all became hopeless.
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