Orcish War Drummers are very *very* difficult foes, especially for beginners.
Frost is a good tool, and I tried it using Meteorstrike, because M. is *very* fast ( I consider it the "machine gun"of all spells. <img src="/ubbthreads/images/graemlins/delight.gif" alt="" /> ) .
But first, I'd say, try to eleminate any other foes, because they might disturb your fighting.