Man, the Takeda Campaign has got to be one of the hardest in Shogun 2. I've tried it 4 times and every time I've ended up at war with everyone. I've never declared war on ANYONE, ONLY fighting defensively, and despite winning every battle (Outside of one-sided sieges) by a good amount, armies just keep pouring in from every direction until I'm defeated.

A shame because I love Calvary in TW games but I don't think I'm ever going to beat the game on anything past hard with them.