Off the top of my head, a simple solution would be to have a function in the base class, that returns an int signifying which class it is. And in each of the derived classes, override this function to return different values. You could use that value to determine which class is being stored in the vector.
There are many solutions to your problem, frankly is the almost most common problem in OOP.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.