The Seven Years War Wikipedia:
http://en.wikipedia.org/wiki/Seven_Years'_War
On the Art of War by Frederick the Great
This edition of Frederick the Great's military instructions to his generals (edited and translated by historian Jay Luvaas) is no longer in print
but you can pick it up cheap on Amazon.com.
Or you can check out Frederick the Great's military instructions to his generals on-line:
http://www.sonshi.com/frederickthegreat.html