I will discuss basic principals of military strategy and then apply them to cyberspace. I will argue that cyber warfighting forces will eventually be large, well-trained, and operate with military discipline. Traditional strategic ideas such as concentration of force, deception, fog of war will be unchanged in the cyber arena. Ironically, the use of very open networking technologies for critical purposes, in a world where wars are still fought, is likely to lead to strong pressure to militarize civilian infrastructures. I will sketch what a cyberwar campaign might look like.