Ok, I'm going to throw out a couple of candidates for our military campaign. We can then discuss pros and cons, and hopefully come up with a priority.
Basic alternatives:
A1) Send pillage force to Saladin
A2) Send assault force to Saladin
B1) Send pillage force to Qin
B2) Send assault force to Qin
C1) Send pillage force to east
C2) Send assault force to east
D1) Send pillage force to west
D2) Send assault force to west
Individual pros and cons
A1)
Send pillage force to Saladin
pros: easy and convenient, quick reward, will delay Saladin
cons: potentially delays main assault
A2)
Send assault force to Saladin
pros: easy and convenient, quick reward
cons: a bit of a dead end, no natural continuation
B1)
Send pillage force to Qin
pros: Will delay Qin
cons: Need QinGate
B2)
Send assault force to Qin
pros: Will stop Qin from becoming too advanced
cons: Need QinGate, may be a dead end (if connection does not exist towards SE)
C1)
Send pillage force to east
pros: will either delay Alex or Toku
cons: need cultural bridge city that is not very useful to us, Alex is not a big threat and it will take a long time until Toku is reached.
C2)
Send assault force to east
pros: will rather quickly remove one AI from the game (Alex), and we can use his cities as production sites for the continent. May enable us to build city for gems and/or ivory and/or gold unless barbs do it first.
cons: need cultural bridge city that is not very useful to us, Alex is not a big threat and it will take a long time until Toku is reached.
D1)
Send pillage force to west
pros: will either delay Asoka or Isa
cons: need cultural bridge, may be too late to have any effect
D2)
Send assault force to west
pros: will get rid of Asoka or Isa
cons: no intermediate goals until we reach Asoka & Isa.
Other notes: a pillage force may work together with spawning barbarians in two ways: (a) take advantage of damaged defenders => raze cities and (b) pillage resources to stop AI from building counter units (axes, mounted units)
Have you noticed the coastline west of Persepolis across the water? Waves can be seen, so there is an island between Qin-land and the continent.