Plot Hook

When the PCs find themselves on the losing side of a war someone has the crazy idea to resurrect a long dead war hero. This hero was a tactical genius and if he was here he’d know how to use the limited resources at hand to ensure victory. When the hero of days gone by is resurrected he does what he’s asked and revels in the chance to lead soldiers again. But once the fighting’s stopped he realizes that he’s alone. Everyone and everything he knew in life have long since passed away. What does he do now? How does he react? If battle is the only thing familiar to him does he start another war just to feel useful and needed?