This campaign I just ignored Jinbo who after three turns not just gave me a peace treaty but a trade agreement and marriage - and then paid me 1750 koku for 5 turns military access and became a firm ally for a few turns until Takeda conquered them.

Fortunately only Takeda and Hojo declared war on the Yamanouchi this time and having left them to be conquered while I was invading Sado island I retook Kozuke and was able to negotiate alliances with the Satake and Satomi for long enough to kill the Hojo.

However typically everything then went pear-shaped: now a vast Ikko Ikki horde is amassing in Suruga to attack the provinces I took from the Hojo, The Takeda had declared war but did nothing for years until I captured Kai upon which 4 stacks of doom commanded by Shingen appeared from nowhere, the Satake and Satomi betrayed me and even the Shimazu have just declared war.

So my only hope lies in the full stack under Kenshin which is on its way to Hitachi and with which I plan to fight all the way up the east coast while laying waste and abandoning everything behind me.