But most places have battle mages of their own, who might not be as skilled but many will be able to hold their own long enough their allies can kill 'em, and we are talking majorly different here too. Lets say we slash the Thalmor number by 7000 due to the great war and the Elves slow replacement of these losses (it could potentially be even less troops, as Khan said 25,515 at best without a counting the great war) then compare that to Hammerfells 33,000. It's almost half the size, the Redguards have about a 15,000 lead on them, and that's a large number advantage. Not saying it's be a walk in the park (Thalmor Battlemages are strong, as you said) but the Redguard definitely hold a fair advantage there I think.