have criminalized "mercenary activity". Intense debates can build up over which term is to be used to refer to a specific group. Using one term over another Irregular military is any military component distinct from a country's regular armed forces, representing non-standard militant elements outside of conventional governmental backing. Irregular elements can consist of militias, private armies, mercenaries, or other non-state actors, though no single definition exists beyond exclusion from national service. Without standard military unit organizatio Auxiliaries – foreign or allied troops supplementing the regular army, organized from provincial or tribal regions. In the Imperial Roman army, it became common to maintain a number of auxiliaries about equal to the legionaries. Levies – feudal peasants and freemen liable to be called up for short-term military duty. Privateer – a "for-profit" private person or ship authorized and sponsored by a government by letters of marque to attack foreign vessels during wartime and to destroy or disrupt logistics of the enemy during "peacetime", often on the open sea by attacking its merchant shipping, rather than engaging its combatants or enforcing a blockade against them. Revolutionary – someone part of a revolution, whether military or not. Guerrilla – someone who uses unconventional military tactics. The term tends to refer to groups engaged in open conflict, rather than underground resistance. It was coined during the Peninsula War in Spain against France. Montoneras – they were a type of irregular forces that were formed in the 19th century in Latin America. Franc-tireur – French irregular forces during the Franco-Prussian War. The term is also used in international legal cases as a synonym for unprivileged combatant (for example the Hostages Trial [1947–1948]). Militia – military force composed of ordinary citizens. Ordenanças – The Portuguese territorial militia system from the 16th century to the 19th century. From the 17th century, it became the third line of the Army, serving both as local defense force and as the mobilization system that provided conscripts for the first (Regular) and second (Militia) lines of the Army. Partisan – In the 20th century, someone part of a resistance movement. In the 18th and 19th century, a local conventional military force using irregular tactics. Often used to refer to resistance movements against the Axis powers during the Second World War. Freedom fighter – A type of irregular military in which the main cause, in their or their supporters' view, is freedom for themselves or others. Paramilitary – An organization whose structure, tactics, training, subculture, and (often) function are similar to those of a professional…