I believe you are talking about the map where there are 4 hills you can't climb (all for sides of the map) and the Pegasus come from each hill, and there are a few Armors that come at you from the north east corner.
You don't need to use Tauroneo, but you may need to use Volug and Sothe a tiny bit. I just disarmed Tauroneo and used him as a shield.
Honestly, all you really have to do is stay to the far right and create a wall against the hill and let jill/archers pick off the Pegasus knights that come from the right. They'll fly down to attack, but then not have enough movement to get back up, so they are exposed. So you keep your weak units in the center, and your stronger units on the edges.
Once you are done with that, I sent Jill to the south and the rest of my army to the north to take care of the next wave of Pegasus. You then draw out the armors and take them out with mages and continue on your way, but move Jill back to the north to take out the last set of Pegasus. Other Pegasus will attack you, but they will be far enough away that you can let them approach and then just take them out with Jill/archers.
The map really isn't that hard at all compared to some of the others.
EDIT: yes, Meg sucks, but she works great as a shield against the Pegasus. I kill her off later in the game when she doesn't shield well any more.
