I'm not proud of the results, but I got it done. The save:
http://gotm.civfanatics.net/saves/sgotm9/Bede_SG009_AD1300_01.SAV
Mostly, I moved troops around and got them on ships for the assault on Celtica.I don't think I had one battle after turn 2. I can't do a proper turnlog, because I can't read my own notes (aren't migraines wonderful?), but here's a sketchy report:
0 1250 AD: Spanish Musketmen advance on Toledo, which is undefended. Salamanca flips back to Spain.
1 1255 AD: Izzy can't be taken out, and Toledo is in danger, so I sue for peace. Izzy gives up
Military Tradition, 9 gold, and ROP.
Celts take Salamanca (!) VSS Crazybeard and 3 Zerks will keep watch.
2 1260 AD: Celts are now a Democracy.
3 1265 AD: Celts offer an alliance vs Spain. Tempting, but they won't sweeten the pot, so I decline.
4 1270 AD: Celts moive on the Ottomans
5 1275 AD: Sell Saltpeter to Ottomans for 9 gpt
6 1280 AD: Spain makes peace with America. Celtic boats headed for Spainish lands and Spanish Galleys headed for Salamanca reverse course.
7 1285 AD: Not surprisingly, Spain and Celts declare peace.
8 1290 AD: Celtic troops converge on Copenhagen from the general direction of Madrid. Threat or just passing through to Salamanca?
9 & 10 1295 &1300 AD: Not much worth mentioning. Our forces are ready to assault Celtic cities on our continent and the Spanish island, and a large amphib force is holding at Trondheim for assault on Celtic homeland. War with Celts may mean loss of Copenhagen, but that's no great loss.
Hope I didn't screw up too badly. Take it away, Cappy!
[EDIT: I forgot to mention, there is now a Caravel in Rusicade ready to do a Dunkirk.]