Acctually, they were quite easy
No, not easy, but easier than I have heard. I may, though, have had an extreme luck
I had Kivan be in the backrow and shot arrows, Khalid beside him using throwing axe + 2
Imoen casting Dart of Stunning.
I (lv 8 mage) had three mirror image memorized, and used minor globe. I used Fireballs when my party members weren't in danger of them.
Jaheira casted Bless and Def Harmony. I casted haste. Monster summoning II, wolves.
Ajantis talked to the last warder, then I just attacked them one after one, begining with the one attacking me (my maincharacter).
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All hail The Wizard!