Double Strike isn't that bad, and the enemy army will definitely have more than just Crusaders. Archers can't hold out forever – unless they're Medusas, of course. The Knight faction is tough; they'll eventually prevail...
That's why I like Archers – they can easily deal damage from a distance. Honestly, it's hard to defend Crusaders because my preference is for Monks.

What if you go with Order in Castle? (just in case?) And you won't always find a Gargantua on the map.

Hmm... will 50 Cyclops defeat 100 Ogres? (I think it's better to compare unit-to-unit – it's more objective, in my opinion, and closer to the real situation). But if it's 50 vs. 50, then yes, the one-eyed ones definitely win. By the way, I'll be at my grandmother's now (no internet :smile05:), so I'll test it out.

Yes, yes :) Okay, we've agreed that I'm a girl.

Hmm, sorry :o But Goblins have magic resistance and stone skin – you have to admit, that's not bad. And they have more health. :)
Yes, Holy Word is a powerful thing. And against living units, Jad or Plague will help (by the way, I'm currently playing through a campaign with Alita – Plague was very helpful).