This is not a "How to kill a dragon in 3 turn" and it is definately not a guide of any sort. it is just what I usually do
Beef up fighters as Zoratok said, make 'em really good.
Summon some good creatures, I found Summon Aerial servant to be a really good summon, which you can get pretty early with your cleric.
Mages, Lower resistance, Greater Malision...
I also used Finger of Death with Anomen (Damn him), which did about 20 damage.
I think a lot of it comes down to luck, whether the dragon saves against your spells, and whether your fighters get criticals!
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