Alphabet is definitely the tech needed to create spy units.
A mission that's successful should transport the spy back to Madrid, unless there's something I've missed.
There's not much need for spears or archers - Charlemagne doesn't have horses anymore and archers would be fairly pointless right now. Swords aren't bad but with 18 axes versus 1 city, even a city on a hill (and a new capital) it should only take 10-12, less if he uses a spy to eliminate defenses for a turn.
At worst, building a spy will let you peek into Charlemagne's city before the army marches and a DOW is made. If Sisiutil strikes quickly (within 15 turns) he should be able to attack before the Iron is hooked up - and if he has a spy he'll know if it's connected, and have the option to destroy it.
I don't think a spy is necessary to get the job done - we certainly made do before BTS - but it's a good option that Sisiutil has at his disposal.
A mission that's successful should transport the spy back to Madrid, unless there's something I've missed.
There's not much need for spears or archers - Charlemagne doesn't have horses anymore and archers would be fairly pointless right now. Swords aren't bad but with 18 axes versus 1 city, even a city on a hill (and a new capital) it should only take 10-12, less if he uses a spy to eliminate defenses for a turn.
At worst, building a spy will let you peek into Charlemagne's city before the army marches and a DOW is made. If Sisiutil strikes quickly (within 15 turns) he should be able to attack before the Iron is hooked up - and if he has a spy he'll know if it's connected, and have the option to destroy it.
I don't think a spy is necessary to get the job done - we certainly made do before BTS - but it's a good option that Sisiutil has at his disposal.