I've heard it often said that Clausewitz refers to war as inextricably linked to politics and war is a continuation of politics. I can reverse that and say that war is within the spectrum of conflict. Can anybody name a book and chapter where Clausewitz says this explicitly? In book 1, chapter 1 he talks around it, and in my version from Penguin classics Anatol Rapoport discusses it.

The reason being I'm reading Charles Tilly "The Politics of Collective Violence", and he says in Chapter 3 that Clausewitz argued for a segregated (from society) military organization. To me that seems totally counter-intuitive to the themes through out "On War". But, I can't find anything to directly refute it.

Suggestions?