a good strategy for your first battle is that to get the starter with the goblin and the centaur archers. Use the goblins to pile anyone and the centaurs giving air support. trust me it helps alot. ill probobly post a video of it on youtube to show you how its done.
you know its weird when the ai gets like an unreasonable amount of a unit. once i fought an ai and it sent out like 100 centaur archers! and like 50 black knights! at the same time!