I was up for Wintergrasp the other day and ended up being involved in an odd battle.
As noted, this picture was taken just over two minutes into the battle.
There are 11 vehicles rolling towards the keep. Not catapults, but demolishers and siege engines.
At some point between the kick off and that point, 11 members of the horde team managed to get promoted to lieutenant and roll almost all the way to the keep. More than 11 actually, since at least one siege engine has gone down in that picture.
Usually in the morning battles in which I get involved, the first 3-5 minutes is spent standing around at the front gate of the keep trying to kill enough people so you can get the rank gain that allows you to pilot first catapults then siege engines and demolishers.
In fact, one of the most effective keep defenses I ever saw was when the horde side simply refused to come out and play, denying us kills and thus denying us vehicles. Once we got a vehicle or two, they would pop out, concentrate on that vehicle, then duck back again.
But then there was the picture above. How did they do it? Is there another way to get promoted to lieutenant besides killing opposition players? I believe that opposition NPCs also count towards rank, but that is still a lot of NPCs to get in two minutes.
Needless to say, we lost that round of Wintergrasp pretty quickly.