Defeat Them in Detail: The Divide and Conquer Strategy. Look at the parts and determine how to control the individual parts, create dissension and leverage it.
Robert GreenePeople who are reading my books, or who are thinking about it, have some general idea about the concept of strategy. They're better off than somebody that has none. So I would never say it's useless.
Robert GreeneThere is almost a touch of condescension in the act of hiring friends that secretly afflicts them. The injury will come out slowly: A little more honesty, flashes of resentment and envy here and there, and before you know it your friendship fades. The more favors and gifts you supply to revive the friendship, the less gratitude you receive.
Robert Greene