Hoburgs and Devils

[UberPenguin]

I was playing as Arco (Arcosophrodale or however you spell it, I just call it arco) and I came upon a province in my conquest of the level 9 indies. Citala, 70 units, "made up of about 70 units, mainly hoburg gaurds, hoburg crossbows and devils." When I sent my elite corps there, 75 hoplites with 50+ archers for support, my god, and about 6 mystics, priestesses and astrologers... it turns out that there were three hoburgs, and 67 devils apparently. I'd really like to know if this is common, because it was a real bummer when a walk-over victory turns into a massacre.