Alright, I have been wanting to throw my PC's into a full scale war (to the extreme of Helm's Deep in LOTR 2). The idea is they will be defending against an army of Anti-Paladins. The number of Soldiers, the resources, and amount of money is all relatively fixed for both sides.The enemy will be attacking with siege weapons, heavy and light infantry, and evil mages. The PC's will aid in defending with the army, the aid of the Church, the mage academies, and a support army of paladins.
For this I have several questions.
1. How would I give experience for surviving the war (my thought is to give them a base amount of XP and add all enemies they kill on top of it + Xp for any other smart decisions they make)
2. How would Mages used magic to create a worthy defence system to protect the integrity of their walls etc?
3. What kind of preparations would a fantasy city make to protect itself? I mean we know there will be the collection of resources, and the fortification of the city but is there more that the city can do in a Pathfinder world?
And is there anything else I should consider?
Thank you guys