In Finland, long-range patrols (kaukopartio = long-range scouts) were especially notable during World War II. For example, Erillinen Pataljoona 4 (4th Detached Battalion), a command of four different long-range patrol detachments; Detachment Paatsalo, Detachment Kuismanen, Detachment Vehniäinen and Detachment Marttina operated throughout the Continuation War phase of the war.
These units penetrated Soviet lines and conducted reconnaissance and destroy missions. During the trench warfare period of the Continuation War, long-range patrols were often conducted by special Finnish sissi troops.
After the war NATO hired a former members of 4th Detached Battalion to spy on Soviet Union military bases on the Kuola and Karelia peninsulas.
NATO ended the spy operation in 1957. Espionage data were obtained from the forward satellite.
Former President of Finland, Mauno Koivisto, served in Lauri Törni's specially designed Jäger Company (called 'Detachment Törni') in the Finnish 1st Infantry Division.
Lauri Törni (Larry A Thorne = The Green Berets, John Wayne) became a US citizen and entered the US Army Special Forces. He gave important knowledge in long-range patrolling techniques and was declared MIA during the Vietnam War in 1965, until his remains were found and were buried in Arlington on 26 June 2003.
Sissi is a Finnish term for light infantry which conducts reconnaissance, sabotage and guerrilla warfare operations behind enemy lines. The word sissi, first attested in the modern meaning "patrolman, partisan, spy" in 1787, comes to Finnish from Slavic and refers either to a forest bandit or his yew bow.
The Finnish Army Sissi units are trained to conduct long range reconnaissance patrols, gather intelligence from concealed observation posts, raid enemy installations (especially supply depots), conduct road side ambushes and pursue and destroy enemy special forces units.
In wartime, an unspecified number of reservists assigned to Sissi battalions would deploy and operate as small groups up to company size. They are meant to stay behind and covertly operate against enemy forces in their area of responsibility even if regular friendly troops have been forced to retreat.
Wars between Russia and Finland have a long tradition of Finnish sissi warfare. Famous sissi leaders have included Pekka Vesainen (c. 1540—1627), Tapani Löfving (1689–1777, fought during the Greater Wrath), and Olli Tiainen (1770–1833, fought during the Finnish War).
Before the hostilities of Winter War, the Finnish Borderguard formed 25 Independent Battalions (Erillinen Pataljoona) from local reservists along the border area. After the outbreak out of hostilities, a further five Sissi Battalions (Sissipataljoona) were formed from "auxiliary personnel". These battalions especially those of the latter type, were below their nominal strength in both men and weaponry. These units proved to be effective in using motti tactics in their native area with light infantry weapons and skis.
In the Continuation War the ad hoc Sissi Battalions were discontinued, but Independent Battalions were raised, 4th Independent Battalion was directly under the command of Supreme Headquarters doing LRRP and raiding missions deep inside Soviet area. In the Battle of Ilomantsi, soldiers of the 4th disrupted the supply lines of the Soviet artillery, preventing effective fire support.
The ammunition and rations torpedoes discharged
In the Ladoga Karelia front the length of the front, absence roads and lack of troops prevented continuous front lines during the trench warfare period. Both armies used a chain of fortified field bases separated by the wilderness, monitoring and controlling the gaps with patrols.
Both Finns and Soviets launched raids and recon patrols into enemy territory.
Volunteers - Neighbor village men prepare for the hunting
Volunteers partisans persecutor / hunters
Russian partisan and patrol mens
Battles were short clashes of lightly armed infantry groups from squadron to battalion in size, with little chance of support or reinforcements.