Why is my army blind?

[Conq]

So im playing a game against the AI and I have a small thug army of 4 kitted out gargoyles, 2 kitted iron dragons, and one kitted siege golem.

I'm playing on an old computer (at work ) so I cant really watch the battle replays because they are so slow. Right now i'm fighting against Marignon and they somehow managed to blind every single one of my units and I have no idea how, so now i'm sending them back to the castle to wait for the Chalice to get passed around.

And as a side note if I put an eye of aiming on them will it fix their blindness permanently?

Thanks