But you can't cast Battle Cry until 1 of your units has a turn. Typically the dragons and archdemons have already torn you up by then. Onslaught is helpful, but not critical to survival.
As for a Demonis army, if you have Magic Shackles 3, then use lots of archers. Imps and Demonesses are garbage without their special attacks, and no demons have any kind of ranged attack. Other than that, I found the most useful unit to be Dryads because of Lullaby. It will knock out Cerberi and Imps which makes taking down the other units a lot easier.
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