I'm sure it's been said, but even 5000 alliance guards could probably take out a group of 100 US marines, just because it's 5000 people. I understand that machine guns and such are a problem, but it's still 5000 people against 100 people. Plus when you imagine that the alliance can still use healers, shields, mages, rogues, bowmen, and gunmen, it just becomes a massacre. Honestly. A better question would be like 100-300 alliance soldiers (Rogue, Warrior, Hunter, Monk, maybe Death Knight, Priests, and MAYBE Paladins) vs. 100 US marines. No mages, so people don't freak out with "OMG 1 MAGE WINS OVER 10000000 MARINES".