A comeback here, as the last BOTM I played was BOTM05!
Having read kcd-swede's description "your lands are impoverished and infertile. You will have difficulty finding health and happiness resources unless you can find the Sampo.", I immediately planned to go on an early war or two, in order to grab some juicy AI-capitals, and win a Military Victory of some kind.
I was happy when I found Horses in the immediate surroundings, and the plan was ready: HA-rush!
I'm still looking for those juicy AI-Capitals, though!
I then made a 1st mistake that should pay-back later: I stole 2 of Isabella's Workers, although, with our poor land and my slowly-growing cities, I didn't really need them.
We made Peace soon after, at least ...
After Barracks and Stables in my 2 cities (City 2 NE of the Horses), I mainly chopped out some 8-10 HA's and attacked Isabella. I easily took her 2nd city in the multiple-river-area between our Capitals, and I razed a newly founded city on my borders, near the Copper and the Marble.
I moved on towards her Capital, but was afraid to see 1 Spear, 1 Axe, and 3 other units. Probably due to my early Worker-Steal-DOW!

We signed Peace, which gave my Mysticism, Agriculture and Masonry, at least!
I healed and turned towards Sitting Bull. I easily took his Capital, due to some RNG-Luck (the 1st HA withdrew, the 3rd one won at 8.8%-odds

).
His 2 other cities, on the coast near both Coppers, were taken as well; they should help me produce a few more HA's quicker, and Sitting Bull is dead.
It's 1AD now, and I have 10 HA's waiting to DOW on Isabella a 3rd time.
Problem is that, being food-poor everywhere, I don't build these HA-reinforcements quickly enough.
Add to that my 2nd mistake of not farming the 2nd city immediately, as I was thinking Rush, Rush, Rush!, working the Horses and 1 Hill for the

instead of growing first and working more hills!
The plan is to kill Isabella as well, and then DOW Darius, my only friend. He has Ivory in 2 cities though, so I hope that a) he doesn't build any Elephants, having been at peace forever and that b) I can conquer both cities on the 1st turns of the war.
Then I'll turn towards Toku, who, despite being on the other side of that river, is planning war!

I hope he doesn't outtech me ...
I didn't bother looking for the Sampo, after my scouting Warrior spotted that Barb-Ironclad in the Ice ...