But yeah, seriously, the Ambush plan is almost guaranteed to fail barring statistically unlikely events. We
Know he doesn't want to fight us in the hills unless we've been bled white to the point where he could just march in and take what he wants.
When facing a strategic mastermind, you don't beat him by being sneaky, you beat him by weathering his attacks or just hitting him hard in a place that he can't deny battle. Except he's a fully mobile society, so he has no vitals that we can hit that he can't just fucking move out of the way of.
We should either stay the course, or fort up.
Do we know why he attacked our traders? He wants our wealth, and I doubt he will be satisfied with what he can get from the allied settlements. He seems to have beef with us, and it seems like he decided to do something about it. So I really don't think he will be content with simply taking out our allies.
[X] Spiritual
[X] Establish Annual Festival
[X] Lure the nomads deeper into People controlled territory and launch a massive ambush
[X] Send a diplomatic expedition Into the Wild in the hopes of finding someone who can help
He's not, stupid.
He won't walk into a situation where we hold all the cards, and he'd
know that. He explicitly called our greatest advantage that we were 'Stubborn', so us withdrawing before we've been broken will make him smell a rat.
Again, they're beating us because every move they make is the perfect one thanks to hero unit, and so they're basically avoiding our defense efforts. Any time we catch them in a fight, we tend to win.