I ran one campaign where the PC's started out in Northern Ergoth, at the brother (and Knight of the Sword) of a PC's manor. The campaign had the players intercepting messages the Knights of Neraka had been sending across the country to their outposts, the messages all detailed troop movements of the Solamnics, the minotaurs in Silvanesti, and the Ogres of Blode.The PC's found a hidden outpost that was lead by a misterious Knight of the Lilly, who they latter uncovered as a green dragon that had taken onto himself to manipulate the knights as he saw fit. So after the PC's inadvertently helped the Knights of Neraka, they soon uncovered the plan to gather troops in Palanthas and make a move on Solamnia. This colminated in a massive battle just outside of Solanthas, of which two of the PC's died. The Solamnics fended off the attackers, since they had the warnings of the PCs, and sent a force into Palanthas in retaliation. The defeat on the battle fields of Solamnia was enough to weaken the hold on the great city of Palanthas, and after a two month siege, the Knights of Solamnia had retaken the city and freed its people. It was a great campaign, and very straight forward, in which the only plot twist was that of the green dragon.