Me and Jubal decided to test his new map, and here is the result:
I lost.
I fled my mountain base as the celts and built one on the coast, then got constantly harassed by jubal and eventually flanked without noticing. It was a downward spiral from there. I never bothered to shout the mountains, so I didn't notice when he built his base behind me.
On the plus side, our wimmenz duked it out on the ruins of my starting base, and my wimmenz won, only to be brutally murdered by Alexander the Great Woman Beater.