Somewhere on the BL forums there's a screenshot of a Southshore guard congo line chasing people down....funny and fucking stupid at the same time.
1. Remove zerging guards, it's stupid
2. If you don't remove them MAKE THE HORDE GUARDS DO IT TOO FOR FUCK SAKE. There aren't many horde towns that zerg spawn whereas most of the Alliance towns will.
It's the main alliance town in hillsbrad. It's not supposed to be easy. When I was witnessing the past 2 raids, the spellcasters of the horde had no trouble killing the guards. All they did was spam AOE spells.
ALso, think about it. What challenge would it be to form a raid party, raid a city that isnt prepared/expecting it, and just slaughter everything because not enough alliance members are there to make their stand alone.
Regarding the "zerging guards", does this not happen in ANY horde town? When I monitored a couter attack against TM we got chased off by a decent amount of Deaht Guards. We didnt get very far in though.