Free war (Swedish: fria kriget) is a form of guerrilla warfare that is conducted with cut-off smaller military units in enemy occupied territory.
The term is most often associated with the Swedish military,[citation needed] primarily during the Cold War era.
Though Sweden no longer has free war in their official doctrine, there are still military manuals that mention and deal with this subject.
Though there is no mention of free war in the modern Swedish strategic or operational doctrine documents, there are books that deal with this subject, namely Arméreglemente Taktik (Army Regulation Tactics) and certain Handbok Markstrid (Handbook Ground Combat) books.
Larger cities, urban areas, and hilly terrain are especially suitable for the Free War.
The battle is conducted in such a manner that the opponent is surprised and is constantly made to feel threatened.