As a quick reply, I would propably use rushing strategy, if there's mainly shooters and not too powerful melee units guarding them. Use fast units like Horsemen or Griffins and cast haste on them. As a warrior you might have picked up couple of scrolls containing haste.
Also Sleem's Cloud of poison, could diminish some of the tightly grouped shooters' numbers until you get to whack them with your melee troops.
I don't really know how far have you gotten in the game and what sort of troops do you have now, so I don't know what sort of possibilities you have.
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