In our campaign I am playing a female gnome monk\psion.
In a session last year we had snuck into a dwarven fortress held by invading hoards led by a number of giants to open the gate from within.
I think my character was monk 6\psion 1 at the time.
My little gnome held the door of the gatehouse for several rounds against a number of giants who tried every tactic immaginable including grappling and one that tried to bull rush her and failed.
They tried everything to get her out of the doorway, but she held them off until reinforcements could arrive.
It was a scarry combat, but even though she was knocked down to single digits in HP a couple of times she held the door.
The GM just didn't realize that with a good AC to start with, her bonus vs giants, and inertial armor that she could hold the door.
He had thought we would flee the gatehouse after opening the gate, but we stayed in position and attacked the giants to keep the gate open until the army arrived.
It was a good thing too as the giants were not very happy that we had opened the gate for the army sitting on the plain outside.
This doesn't mean that I was the only character who participated in the battle. Any time you are in a situation like this it doesn't hurt to have a devestating archer and a good mage at your back softening up the giants as they attacked you