You may be familiar with the theories of military historian and conservative political adviser William S Lind, that warfare has undergone several major transformations, or generations, since the formation of nation-states.
Very briefly, First Generation, or Formation Warfare (1GW) is where armies line up in formation and fire at each other. Second Generation, or Trench Warfare (2GW) is where armies use trenches as cover from massed firepower. Third Generation, or Maneuver Warfare (3GW) is where armies exploit machinery to maneuver much more quickly than the opponent. And Fourth Generation or, Insurgent Warfare (4GW) applies asymmetrical strategy and tactics against a superior conventional military force, intending to sap the opponent nation's political will to fight.