Settled on the phant for the extra hammer, queued a workboat and citizen worked the forested hill. Tech was Mining->Bronze Working.
Warrior moved south and saw Celtic borders on turn 2 (!). Before it popped even. So I moved closer with an eye to worker steal, but then I saw a completely undefended capital.
So I declare war, and sure enough Brennus pops a warrior next turn. At 11% odds, I dedided to gamble. and lost.
So, having failed to either take a worker, or the Brennus' capital, I have little choice but to queue a worker:
Finished the worker same turn as BW arrives, so I chop and mine a hill while building a 2nd workboat. Then build a Dog Soldier.
Discovered Horse nearby, so teched Wheel next in order to hook up the horse and get a chariot army together.
Meanwhile the Dog Soldier camped on a forested hill north of Bibracte (he's out of turns in this pic).
Settled the 2nd city and teched pottery to build Grainary-Barracks-Chariots* in both cities. At 7 chariots and 1 DS, I attacked 3 archers in Bibracte. Didn't quite take it.
However, 2 chariots and the DS survived, and luckily Brennus didn't get another archer out, so I took Bibracte on the next turn.
If I were continued, plan would be to:
* take Celtia's 2nd city with Chariots
* finish HBR while cottaging Poverty Point.
* build stables everywhere
* HA rush someone else.