Just a thought
I think you are looking at the problem wrong. It is not warfare that has change. It has not. The principals still hold true.
I think the political environment has changed. It is the spread of ideas that encourage individual actors to take a more active role in the fight.
It began to change around the 1700's with the reintroduction of democracy and has been changing ever since. Just look at Napoleon's problems in Spain and his inability to quell the grass roots revolt with conventional forces.
War is a political tool and I believe it has to be viewed in the context of the political environment, not independent of it. War now can be more decentralized, existing directly in the minds of the population. No longer dependent on a king, lord, or state to justify and finance it can exist free of state control bending directly to the will or whim of the people or some fraction of them based on whatever ideal they are espousing.
Then again, I could be totally wrong.
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