even with no inquistor it can be done but will require some carfull planning and sometimes just sheer luck
you will need dragon arrow level 2 (or 15 inteliigence) and dark comander level 3
Army setup:
beholder / evil beholder - flying don't get hit from giants put units to sleep.
skeleton archers - with gloth armor
Shamans - strong and durable, will most likely won't die from the odd earth quake
Vampires - will resurrect themselves
5th unit an be picked from any of the above: ghost/cursed ghost/cannnor/alchemist.
the key with warriror for this setup is to reserach dark commander ASAP and make those skellies hit before the giants, if you don;t have tolerance it's not too bad either because shamans only suffer -1 morale from undead
first turn:
gloth armor on skellies dragon arrows on skellies they will usually kill the biggest stack of giants (hopefully not more than one).
evil beholder mind control enemy shooter
cannoner weaken/destroy another shooter if you care about morale change them to ghosts.
Vampires charge ahead hopefully to lure tha AI to attack them
Shamans place totem in front of shooter or block the giant path from charging, or use axes to disable another shooter. I found out that if a giant can not move on the first turn it will usually not do earth quake
by the end of the first round usually the giant should die or reduced to none lethal level and hopeully you have survived the first turn shoot out.
Tuen 2: vampires reach enemy shooter and mop them up.you can cast target on them now.
skellies (shoot first because dark comander) use dtragon arrow to clean other stack
beholder put someone to sleep.
shamans place life totem to heal themsleves and improve their defense