; The Yuezhi Invasion occurs unconditionally in 172 BC. However, the Yuezhi
; will be very passive unless the player controls the Saka (pontus), the
; Sauromatae (armenia), Baktria (romans_brutii), the Pahlava (parthia), or
; the Arche Seleukeia (romans_julii) AND his faction controls Chighu. For an
; active invasion, we also need a faction to temporarily take control of Chighu.
; This faction ought to be located far away from the east end of the map, since
; transfer of control away from a faction may have negative effects on the AI's
; handling of that faction. These are the Casse (britons), Lusotana (spain), and
; the Qarthadastim (egypt).
;
; So, the Yuezhi will be active if
; (1) The player is pontus, armenia, romans_brutii, romans_scipii, parthia
; (2) He controls Chighu,
; (3) At least one of these factions still exists: spain, britons, egypt.
Copied from MAA's post in TWC
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