It's wild. In the first 3 years I crushed Oda by accidentally isolating him in Owari and losing a battle there... because I sent everyone in on his 11 Heavy Cavalry. I lost, but not after killing him... so I got all his lands.
Then, I was just about to repel a Mori invasion by Mori himself which would have left him no place to flee to (he'd withdrawn from a mere punitive expedition I sent out). And...
I crashed it.If you ALT+TAB out a lot, save early and save often!
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