Gumz argues that "the appearance of insurgency was linked to the breakdown of bracketed conflict and with it the jus publicum Europaeum at the advent of the early twentieth century....Only with the collapse of the jus publicum Europaeum in the first half of the twentieth century in Europe did insurgency assume an increasingly prominent position in war. ... Insurgency’s appearance has less to do with technological changes or advancing stages of war than with normative changes in war’s boundaries."
One could argue the same for conventional war when comparing the cabinet wars of the Monarchists to the revolutionary wars of Napoleon in the 18/19th century. I think its a dangerous game to place any 'normative boundaries' on war. Simply because war is a duel between two or more opponents who will adapt or adjust in order to achieve military victory and meet their political objective. Napoleon exploited the norms of the previous cabinet wars by a using a broadsword instead of a dress rapier, with startling results.