Thanks for explaining that - I can see why my units are not appearing given the low support. Does low support also account for the massive increase in enemy units when I invade?
As per my original post, I have no idea why each enemy unit stack has doubled or tripled once the battle starts.
Aside from that, getting recruitment citadels is near impossible - in the time it takes to send a unit to the nearest recruitment citadel, covert it, and build something on it, the enemy army has reached my starting base and is starting to dismantle it (coincidentally, this is also approximately the earliest point i can summon the dragon).