Fourth-generation warfare (4GW) is conflict characterized by a blurring of the distinction between war and politics, and of the distinction between combatants and civilians.
The term was first used in 1980 by a team of United States analysts, including William S. Lind, to describe warfare's return to a decentralized form. In terms of generational modern warfare, the fourth generation signifies the nation states' loss of their near-monopoly on combat forces, returning to modes of conflict common in pre-modern times.
The simplest definition includes any war in which one of the major participants is not a state but rather a violent non-state actor. Classical examples of this type of conflict, such as the slave uprising under Spartacus, predate the modern concept of warfare.
Elements
Fourth-generation warfare is defined as conflicts which involve the following elements: Complex and long term Terrorism (tactic) A non-national or transnational base – highly decentralized A direct attack on the enemy's culture, including genocidal acts against civilians. All available pressures are used – political, economic, social and military Occurs in low-intensity conflict, involving actors from all networks Non-combatants are tactical dilemmas Lack of hierarchy Small in size, spread out network of communication and financial support Use of insurgency tactics as subversion, terrorism and guerrilla tactics Decentralised forces
History
The concept was first described by the authors William S. Lind, Colonel Keith Nightengale (US Army), Captain John F. Schmitt (USMC), Colonel Joseph W. Sutton (US Army), and Lieutenant Colonel Gary I. Wilson (USMCR) in a 1989 Marine Corps Gazette article titled "The Changing Face of War: Into the Fourth Generation". In 2006, the concept was expanded upon by USMC Colonel Thomas X. Hammes (Ret.) in his book, The Sling and The Stone.
The generations of warfare described by these authors are: First generation: tactics of line and column; which developed in the age of the smoothbore musket. Lind describes First Generation of warfare as beginning after the Peace of Westphalia in 1648 ending the Thirty Years' War and establishing the state's need to organize and conduct war. 1GW consisted of tightly ordered soldiers with top-down discipline. These troops would fight in close order and advance slowly. This began to change as the battlefield changed. Old line and column tactics are now considered suicidal as the bow and arrow/sword morphed into the rifle and machine gun. Second generation: tactics of linear fire and movement, with reliance on indirect fire. This type of warfare can be seen in the early stages of World War I where there was still strict adherence to drill and discipline of formation and uniform. However, there remained a dependence on artillery and firepower to break the stalemate and move towards a pitched battle. Third generation: tactics of infiltration to bypass and collapse the enemy's combat forces rather than seeking to close with and destroy them; and defence in depth. The 3GW military seeks to bypass the enemy, and attack his rear forward, such as the tactics used by German Stormtroopers in World War I against the British and French in order to break the trench warfare stalemate (Lind 2004). These aspects of 3GW bleed into 4GW as it is also warfare of speed and initiative. However, it targets both military forces and home populations.
The use of fourth-generation warfare can be traced to the Cold War period, as superpowers and major powers attempted to retain their grip on colonies and captured territories. Unable to withstand direct combat against bombers, tanks, and machine guns, non-state entities used tactics of education/propaganda, movement-building, secrecy, terror, and/or confusion to overcome the technological gap.
Fourth-generation warfare has often involved an insurgent group or other violent non-state actor trying to implement their own government or reestablish an old government over the current ruling power. However, a non-state entity tends to be more successful when it does not attempt, at least in the short term, to impose its own rule, but tries simply to disorganize and delegitimize the state in which the warfare takes place. The aim is to force the state adversary to expend manpower and money in an attempt to establish order, ideally in such a highhanded way that it merely increases disorder, until the state surrenders or withdraws.