by William S. Lind
"Second Generation warfare was one answer to this contradiction. Developed by the French Army during and after World War I, it sought a solution in mass firepower, most of which was indirect artillery fire. The goal was attrition, and the doctrine was summed up by the French as, "The artillery conquers, the infantry occupies."
Second Generation warfare came as a great relief to soldiers (or at least their officers) because it preserved the culture of order. The focus was inward on rules, processes and procedures. Obedience was more important than initiative (in fact, initiative was not wanted, because it endangered synchronization), and discipline was top-down and imposed.
Second Generation warfare is relevant to us today because the United States Army and Marine Corps learned Second Generation warfare from the French during and after World War I. It remains the American war of war, as we are seeing in Afghanistan and Iraq: to Americans, war means "putting steel on target." Aviation has replaced artillery as the source of most firepower, but otherwise, (and despite the Marine's formal doctrine, which is Third Generation maneuver warfare) the American military today is as French as white wine and brie.
Third Generation warfare, like Second, was a product of World War I. It was developed by the German Army, and is commonly known as Blitzkrieg or maneuver warfare.
Third Generation warfare is based not on firepower and attrition but speed, surprise, and mental as well as physical dislocation. Tactically, in the attack a Third Generation military seeks to get into the enemy's rear and collapse him from the rear forward: instead of "close with and destroy," the motto is "bypass and collapse." In the defense, it attempts to draw the enemy in, then cut him off. War ceases to be a shoving contest, where forces attempt to hold or advance a "line;" Third Generation warfare is non-linear.
Characteristics such as decentralization and initiative carry over from the Third to the Fourth Generation, but in other respects the Fourth Generation marks the most radical change since the Peace of Westphalia in 1648. In Fourth Generation war, the state loses its monopoly on war. All over the world, state militaries find themselves fighting non-state opponents such as al Quaeda, Hamas, Hezbollah, and the FARC. Almost everywhere, the state is losing."