Mauled by my own lesser horror

[Sly Frog]

Man I wish the spells gave better descriptions of exactly what they do.

I just cast lesser horror, when I actually had a decent army in the area. Of course it immediately killed my expensive Jotun caster, and then proceeded to maul my own troops, never once attacking the enemy. I understand attacks all troops on the battlefield; I did not think that meant it would actively prefer to kill mine.