If you want to get a taste of how Proudhon argues in
War and Peace, I've translated 17 pages from the first volume, where Proudhon is explaining the "right of force."
Here are Chapter XI and the Conclusion of Book Two of Volume One.
A couple of things to remember, or to consider if you haven't read my other discussions of Proudhon:
1) He uses the French word
droit, which can mean either "law" or "right" in a way that is most accurately translated, as far as I can see, as "right," but which does not, or does not necessarily refer to the sort of natural or political
rights we are accustomed to talking about. Every group, ensemble, being, etc., has its own "law" (
loi) of organization, which determines what is "right" (appropriate, proper, logical, natural, etc) for it to do. Likewise, it participates in larger ensembles with their own laws, which condition those of the individuals.
Droit remains something of a mix of what we might call natural law and/or right, as well as covering more strictly descriptive (rather than normative) grand. Just don't necessarily assume that Proudhon is trying to anything more than describe the normal functioning of presently-existing "bodies" of one sort or another.
2) This is part of an explicitly historical, progressive account. The basic argument of the book is that all of our "higher-level" rights, and really all of our more peaceful institutions, as well as all those which we have yet to create, are part of a historical series which begins with relations mediated by raw force. Peace would be the end of that series, presumably, but war would always be its origin. Peace is, in a strong sense, the end product of the process of war. And, Proudhon says, we have got ourselves into some real trouble by denying this historical fact.
3) Proudhon speaks of "right of force" and "right of war," but these, he argues, are like all true rights, equal and reciprocal. If there are, or have been, certain circumstances in which the right of the strongest has been or can be our model for justice, justice is still a restless demand for balance, and ultimately justice cannot be fulfilled at any acceptable level by silencing or excluding the weak. It is not clear that there is a "right to war," but instead a sort of protocol for dealing with the wars that occur, and which can only justly occur in circumstances of social or political imbalance or injustice. Proudhon talks about the "right of labor" to its product, and contrasts that with the "right to work."
The translation is very rough and literal. I wanted to get through enough of this to clarify for myself how it fit with the things I'm working on more seriously. I'll try to clean it up sometime, but probably not for a few months.