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Engineers (Finnish Defence Forces)

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Engineers
Pioneerit
Finnish lion holding straight sword while trampling curved one on black flag
The Colours of the Jäger engineers, later also used by the Engineer Regiment
CountryFinland
RoleMilitary engineering
MarchPioneerien taistelulaulu Koljonvirran marssi
Anniversaries25 July (Battle of Schmarden)
Commanders
Inspector of Engineering and CBRNeColonel Riku Mikkonen[1]
Navy Chief of EngineersLt Cdr Juha Lepistö[2]
Air Force Chief of EngineersMajor Joni Pirinen[3]
Insignia
Engineer training branch insignia
EOD training branch insignia
CBRNe training branch insignia
Boat man training branch insignia
Training branch insignia used by Navy engineers

Engineers (Finnish: Pioneerit, Swedish: Pionjär) is a service branch of the Finnish Army. The branch contains the training branches of engineering, explosive ordnance disposal (EOD), and CBRNe. Engineering equipment operators are also trained for the branch's needs. Engineers are responsible for aiding the movement of friendly troops and disrupting the enemy's movement, EOD clear explosives in challenging areas, and CBRNe is responsible with dealing against chemical, biological, nuclear and incendiary weapons.[4]

History

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Swedish rule

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The earliest record of Finnish military engineering was crossing the river Lech in 1632 during the Battle of Rain. Finnish troops would perform engineering tasks in several other wars during Swedish rule.[5]

Jäger Movement

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During the First World War, almost 1,900 Finnish men went to Germany to receive military training as part of the Jäger Movement. Out of the volunteers was formed the 27th Jäger Battalion.[6]

An engineer company was formed in the Lockstedter Lager [fi; de] training unit on 28 August 1915.[5] Their training involved various engineer skills, such as fortification, mining, makeshift bridges, and pontoons, in addition to infantry training. When the battalion was formed in May 1916 and sent to the front, the engineer company was 249 strong, 217 of whom were Finnish. When the battalion went to the front on the Misa river, the engineers were designated as the reserve, and worked on building fortifications. Watery conditions, disease, and problems with food supply made conditions miserable.[6]

On 22 July 1916 the engineers received a movement order, and the next day they, excluding the German non-commissioned officers and 32 Finns, marched to the Riga–Jelgava Railway and were transported to the Schlamp station, from where they moved to encamp at Sale. The next evening the engineers moved to the rally point where they were divided into the infantry squads, 2-3 men per one, of the Reserve Jäger Battalion 1. The attack began at midnight, with the engineers' acting commander lieutenant Basse staying behind. The engineers successfully reached the Russian positions at Smārde (German: Schmarden) and captured five enemies. The Finns received praise from the Germans, including General Wyneken. Two Finns, Paavo Kinnunen [fi] and Matti Fält [fi], died as a result of the battle.[6] The battle was the so-called Jäger engineers' (jääkäripioneeri) babtism by fire, and became known as the Battle of Schmarden. Its anniversary is celebrated as the branch's anniversary day.[5]

The engineers returned to near Smārde on 14 August 1916 to conduct building and forest clearing work. As the German engineers had previously thought the work to be too dangerous, the Finns gained a reputation for courage, which resulted in better food supply reliability.[6]

The battalion moved to the coast of the Gulf of Riga in late August, and the engineers did missions deemed communal or dangerous. The engineers did construction, including the fortification of a base called Laus, destruction of visual barriers, and supported patrols.[6]

soldiers marching
The engineer company, Liepāja summer 1917

The battalion moved to Liepāja for training and preparations for a return to Finland in March 1917. Most of the company spend the spring and early summer on an engineer course, with many Finns from other companies also participating. Some engineers also participated in other specialized courses. The engineer company had 152 men when the majority of Finns returned to Finland 25 February 1918. The jägers dispersed to various units on return. Less engineers were sent to the Altona-Barenfeld work detachment, meaning they received less diciplinary punishments, and more received the Jäger Memorial Badge, i.e. served honourably, than on average.[6]

Early independence

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During the Finnish Civil War engineers on both sides focused mostly on the destruction and repair or railways, especially railway bridges. There was not much engineer activity, as many Jäger engineers commanded infantry due to the lack of experienced soldiers.[7]: 87–88 

Early doctrine was mainly based on German and French ones.[8] The building of fortifications was held as an important among Finnish engineers, and it was trained up to the beginning of the Winter War.[9]: 45–46 

Engineer Battalion 1 was founded at Koria on 9 December 1920.[5]

The Technical Troops Command was formed in 1921, following the French model,[10] under which Engineers was also designated.[11] According to Santeri Sohlman, this unification of command was as much a strategic decision, as a way of cutting on costs.[12]: 65  Under it Engineer and Signals officers had the same base training, and would often work in units belonging to both branches during their careers.[7]: 109–110 

The Technical Troops were disbanded on 30 April 1927, with its commander becoming the Inspector of Technical and Logistics Troops, who lead the branch specific training and equipping of Logistics and the Erillinen hyökkäysvaunukomppania [fi] tank company in addition to Engineers and Signals.[12]: 40 

The Inspector of Technical and Logistics Troops became the Technical Inspector of the Defence Forces in 1933, with the Engineer and Signal units of all branches of the Defence Forces coming under his control, and the War Technical School (Sotateknillinen koulu) for technical troops was founded.[12]: 48  For the existence in various forms of technical troops, they were led by Engineer trained officer Unio Sarlin.[12]: 67  Separate Engineer and Signals sections were formed on 4 October 1939, as centralized command of Engineer troops was needed for maximizing the efficiency of fortification works.[12]: 68 

In the 1920s, with divisions included two engineer companies, with separate engineer units for use of higher command.[9]: 45  Engineer skills focused on building fortifications, water crossings,[8] and the maintenance of roadways.[9]: 45 

The creation of engineer battalions, three companies, for divisions, with special road maintenance units for corps was decided before the Winter War but was not implemented before it began.[9]: 46, 174 

Coming into the 1930s, engineers were still focused supporting movement in line with the attack focused spirit of the Finnish Army at the time.[9]: 174  During the decade the focus formed around movement support and counter-mobility.[8] Mining also started became its own thing, and anti-tank work became more emphasized towards the end of the decade. However counter-mobility tactics were not integrated into unit training until the very end of the decade.[9]: 46  The development of Iivari's quick bridge enabled infantry to perform small water crossing on their own, enabling engineers to focus on larger crossings.[9]: 46 

The Gas Protection School (Kaasusuojelukoulu) was founded in Vyborg in 1933.[5] The need for protection against battle gases was well accounted for in the wartime structure of units.[9]: 181 

The Winter War

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Finnish equipment during the Winter War was inadequate, with only 5,000 anti-tank mines,[9]: 46  leading to improvised mines being used.[8]

Although there were suspicions of use of chemical weapons by Soviet troops in December 1939, tests were inconclusive, and consensus by the end of the war was that none were used.[9]: 181 

Engineer troops were often poorly utilized during the war, even used as infantry, as the lack of field exercises before the war caused problems with branch co-operation.[9]: 174  The value of engineers became clear to infantry leadership during the Winter War,[5][8] as the value anti-tank work cleared the idea that engineers would just build the infantry's fighting positions.[9]: 174 

Temporary anti-tank troops were often formed from engineer troops by division commands.[9]: 143 

Structural changes were made September 1940. Special units were officially designated independent, as had been practice during the war. The manpower involved in the command of engineer troops was also increased both on the division and corps level. Both experienced further expansions in 1943.[9]: 174–175  Engineer troops were increased and gained mechanical equipment, and co-operation with other branches was developed.[8]

As fortifications had proved to be a great preventer of losses and a leveler of the equipment disparity between Finland and the Soviet Union, it was emphasized and leadership was transferred from the engineer leadership to directly Mannerheim with Edvard Hanell [fi] responsible.[9]: 175 

The Continuation War

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Men in grey winter coats stand on wooden supports of a half built bridge in winter
Engineers building a bridge over the Svir river, Voznesenye 18 March 1942.

During the offensive phase of the Continuation War engineers focused on mobility operations, with frontline troops clearing enemy mines and facilitating water crossings. Rear troops fixed roads and bridges.[9]: 175 

During the slow phase engineers had responsibility for fortifying the front. The deep counter-mobility (syvä suluttaminen) skill was developed during this time.[5] Focus was on the maintenance of obstacles and the expansion and maintenance of roadways[9]: 176 

During the retreat phase of the Karelian offensive in the summer of 1944, engineers were responsible for destroying routes in order to slow the Soviet advance,[5] and helping friendly mobility. After the Soviet assault was stopped, counter-mobility and road work became important.[9]: 176 

As the need for combat engineers capable of clearing dugouts became clear during the Winter War, Walter Horn in autumn 1940 and Eero-Eetu Saarinen [fi] in February 1941, were sent to observe German combat engineer training. Germany did not allow more Finnish participation till April 1942 when 28 engineer officers participated on a specially held course.[9]: 175 

Combat engineers as a training branch was started, and training began in June 1941, although it was cut short by the beginning of hostilities. During the war combat engineer roles, such as strike groups and flamethrower use, was formalized on various unit levels.[9]: 175 

Due to the lack of CBRNe threats, CBRNe troops focused on tasks such as disinfection, pest termination,[5] and fire fighting. The use of covering smoke was also designated to CBRNe. Engineers also used smoke grenades and boxes during assaults.[9]: 182 

The Lapland War

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Due to the prevalence of rivers and German obstacles, there was a large amount of engineer troops assigned to the III Corps during the Lapland War. Engineers focused on clearing counter-mobility measures and repairing destroyed roads and bridges.[9]: 176 

Post-war

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Two finnish soldiers with mine prods squat over unexploded artillery grenade while more stand in the background
Deming in Porkkala, 1956

After the end of hostilities with the Soviet Union, demining operations both inside Finland and the ceded territories began.[9]: 176 

The Keuruu Engineer Regiment [fi] was founded in 1967.[13]

Deep counter-mobility was codified in the 1960s and the three stages of barrier readiness[5], III: barrier planned and prepared with reserved materials, II: barrier mostly executed with passage possible at limited points, I: barrier fully executed with no passage possible,[14] were defined in the 1980s.[5]

CBRNe was folded into the engineers in 1991.[8]

Involvement in international operations since the 1990s has helped develop competence in the branch.[8]

Post 2000

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Finland joined the Ottawa Treaty banning anti-personnel mines (AP mines) in 2012, and destroyed last of the banned mines in 2015.[15] Former head of the Department of Strategy at the National Defence University of Finland, Heikki Hult, has spoken that AP mines are the most important part of infantry warfare, and that the ban is unnecessary as Finnish mines are always well documented. In contrast, Chief of Operations, Jari Kallio [fi], has said that other systems have effectively filled the void left by AP mines, except for the psychological effect of mine terror.[16]

Finnish and American troops next to yellow and blue boxes of practice mines in a snowy forest
Finnish and American troops training anti-tank mining

Finnish troops from the Keuruu Engineer Regiment performed risk assessments and oversight during the destruction of Syria's chemical weapons.[17] They began their work in December 2013 and returned to Finland in July 2014. 18 professional and reserve soldiers were involved in the operation.[18]

The Keuruu Engineer Regiment was disbanded on 31 December 2014.[13]

Chief of Defence Janne Jaakkola spoke on the need of re-evaluating Finland's participation in the Ottowa Treaty based on the mass use of infantry by Russia in the invasion of Ukraine, in October 2026.[19] Following this, a civic initiative was submitted and gained the required signatures, and the Finnish Government started considering withdrawal.[20] The parliament voted in favor of withdrawal on 19 June 2025,[21] and it came into effect on 10 January 2026.[22] The training and preparation of acquisitions started on the same day, [23][24] with directional charges beginning to be trained as mines using tripwires, and newly designed Finnish made mines planned to begin use in 2027.[25][26]

Training and units

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As of 2026, engineers are trained at the following units:[4]

Karelia Brigade:[27]

  • Kymi Engineer Battalion [fi]: Boat drivers[28]
    • 1st Engineer Company: Non-commissioned officer (NCO) training, readiness unit combat engineers, engineer equipment operators
    • 2nd Engineer Company: counter-mobility engineers, combat engineers
    • EOD Company: EOD NCOs for all FDF units, EOD

Kainuu Brigade:[29]

  • Pohja Engineer Battalion [fi]: Engineers, pontoons, boat drivers, CBRNe reconnaissance, and equipment operators
    • 1st Engineer Company
    • Technical Company

Pori Brigade:[30]

Armoured Brigade:[31]

Jaeger Brigade:[32]

  • Lapland Jaeger Battalion:
    • 1st Jaeger Company: ranks and file combat engineers
    • Heavy Support Arms Company: Engineer platoons. NCO training is done in Kainuu Brigade[33]

Guard Jaeger Regiment:[34]

  • 1st and 2nd Military Police Company: A selected numbers of specialist
  • 1st Jaeger Company: Engineer fireteams for urban areas

Nyland Brigade (Navy):[35]

  • Ekenäs Coastal Battalion:
    • Engineer Company: Combat engineers, coastal engineers, EOD, rescue, and engineering equipment operators

Lapland Border Guard District [fi] (Border Guard):

  • Border Jaeger Company (Ivalo): All trained in basic engineer skills, with possibility of further specialization[36]

North Karelia Border Guard District [fi] (Border Guard):

  • Border Jaeger Company (Onttola [fi]): All trained in basic engineer skills, with possibility of further specialization[37]

Southeast Finland Border Guard District [fi] (Border Guard):

  • Special Border Jaeger Company (Imatra): Possible specialization[38]

Army Academy:[39]

  • Reserve Officer School: All reserve officers
  • The Education and Training Centre: Planning, preparing, and implementing training for professional soldiers
  • Army Research Centre: Research and development[42]

All of the units also include various supporting roles, such as truck drivers and signals.

Insignia

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Engineer collar insignia

When collar insignia came to use in 1936, engineers used the technical troops ones with a purple background with black piping on it. In 1939 engineers got their own collar insignia with a purple background with light grey piping on it,[43] which is used as of 2026.[44] Purple is an international colour of science and technology, and grey might be referring to infantry, which also has grey piping on their collar insignia.[43]

CBRNe's collar insignia was orange with black piping from 1996 to 2003.[5] As of 2026 they use the same collar insignia as the engineers.[44]

When the training branch insignia were taken into use on 5 December 1949, the Jäger engineer insignia was the same as the current engineer one, but with a green background. The Engineer Regiment had their own, a red cog with a yellow explosion on a red background behind it. The current EOD insignia was authorized in the 2000s.[45]

There exists an unofficial training branch insignia for urban engineer that is used during exercises.[46]

See also

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References

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  1. ↑ "Army Command". maavoimat.fi. Retrieved 23 June 2026.
  2. ↑ "Katsaus Merivoimien pioneeritoimintaan" (PDF). Hakku (in Finnish). Vol. 605. 2023. pp. 6–8. Retrieved 25 June 2026.
  3. ↑ Vesikansa, Valtteri (4 May 2025). ""Kaikki tekevät tämän hieman eri tavoin" – Nato-pioneerit harjoittelivat kiitotien korjaamista Suomessa". Ruotuväki (in Finnish). Retrieved 22 July 2026.
  4. 1 2 Conscript 2026: A guide for getting ready for military service (PDF). Finnish Defence Forces. 2025. p. 43. ISBN 978-951-25-3533-0. Retrieved 23 June 2026.
  5. 1 2 3 4 5 6 7 8 9 10 11 12 Simola, Seppo (16 October 2016). "Historia: Suomalaista pioneeritoimintaa oli jo 30-vuotisessa sodassa". Reserviläinen (in Finnish). Retrieved 23 June 2026.
  6. 1 2 3 4 5 6 Loikkanen, Jarmo (2023). "Jääkäripioneerit" (PDF). Hakku (in Finnish). Vol. 603. pp. 10–13.
  7. 1 2 Mäkitalo, Janne (2019). Räjähtävää voimaa 1: suomalaisen pioneeritaktiikan kehittyminen itsenäisyyden aikana [Explosive power 1: the development of Finnish engineer tactics during its independence] (PDF). Julkaisusarja 1: Tutkimuksia (in Finnish). Vol. 34. Keuruu: Maanpuolustuskorkeakoulu. ISBN 978-951-25-3104-2.
  8. 1 2 3 4 5 6 7 8 Simola, Seppo (8 January 2025). "Suomalainen pioneeritaito juontaa juurensa yli sadan vuoden takaa". Reserviläinen (in Finnish). Retrieved 24 June 2026.
  9. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Tynkkynen, Vesa (2014) [1996]. Hyökkäyksestä puolustukseen: taktiikan kehittymisen ensimmäiset vuosikymmenet Suomessa (PDF). Julkaisusarja 1 (in Finnish). Vol. 1/2014. Helsinki: Maanpuolustuskorkeakoulu. ISBN 978-951-25-2547-8.
  10. ↑ Simola, Seppo (5 November 2026). "Historia: Vain perille mennyt viesti ratkaisee". Reserviläinen (in Finnish). Retrieved 26 June 2026.
  11. ↑ "Viestijoukot 100 vuotta". viestiupseeriyhdistys.fi (in Finnish). 26 November 2017. Retrieved 22 July 2026.
  12. 1 2 3 4 5 Sohlman, Santeri (2023), Viestiaselajin itsenäistyminen oman aselajijohdon alle vuonna 1939 (in Finnish), Maanpuolustuskorkeakoulu, retrieved 22 July 2026
  13. 1 2 Savela, Sanna (31 December 2014). "Keuruulla laskettiin lippu viimeisen kerran". Yle (in Finnish). Retrieved 24 June 2026.
  14. ↑ Jääkärijoukkueen ja -ryhmän käsikirja 2018 (PDF). 2018. p. 42. Retrieved 25 June 2026.
  15. ↑ Juntunen, Esa (18 August 2015). "Jättipaukku tuhoaa viimeiset putkimiinat ja sinetöi miinakiellon – puolustusministeriä harmittaa". Helsingin Sanomat (in Finnish). Retrieved 24 June 2026.
  16. ↑ Vaino, Juha (5 January 2018). "Sotilasasiantuntijan mukaan Suomen pitäisi irtautua Ottawan sopimuksesta: "Edes itänaapuri ei reagoisi"". Ilta Sanomat (in Finnish). Retrieved 24 June 2026.
  17. ↑ Vuorela, Arvo (11 December 2013). "Keuruun Pioneerirykmentin suojeluosasto matkasi Syyria-operaatioon". Yle (in Finnish). Retrieved 24 June 2026.
  18. ↑ Esa, Miia (3 July 2014). "Syyrian kemiallisten aseiden tuhoamisessa auttaneita suomalaissotilaita kotiin". Yle (in Finnish). Retrieved 24 June 2026.
  19. ↑ Nykänen, Maria (23 November 2024). "Puolustusvoimain komentaja Janne Jaakkola haluaa keskustelua jalkaväkimiinoista: "Nyt turvallisuusympäristö on aivan erilainen"". MTV Uutiset (in Finnish). Retrieved 24 June 2026.
  20. ↑ Kauranen, Anne (18 December 2024). "Finland considering exiting anti-personnel landmine treaty, minister says". Reuters. Retrieved 24 June 2026.
  21. ↑ "Finnish parliament votes to exit landmines treaty due to Russia threat". Reuters. 19 June 2025. Retrieved 24 June 2026.
  22. ↑ "Finland's withdrawal from Ottawa landmine treaty takes effect". Yle. STT. 10 January 2026. Retrieved 24 June 2026.
  23. ↑ "The Defence Forces starts measures for acquiring anti-personnel landmines and launching training". puolustusvoimat.fi. Finnish Defence Forces. 14 January 2026. Retrieved 25 June 2026.
  24. ↑ Tihilä, Katri (14 January 2026). "Jalkaväkimiinat palaavat käyttöön – valmistelut alkavat heti". Yle (in Finnish). Retrieved 25 June 2026.
  25. ↑ Ronikonmäki, Kalle-Emil (13 March 2026). ""Vaikuttaa tehokkaalta ja toimivalta" – Jalkaväkimiinojen koulutus käynnistyi viuhkapanoksilla". Ruotuväki [fi] (in Finnish). Retrieved 25 June 2026.
  26. ↑ Tanner, Matti (3 February 2026). "Koulutus alkoi – Eversti paljastaa miinojen hintahaarukan ja esittää pyynnön yrityksille". Iltalehti (in Finnish). Retrieved 25 June 2026.
  27. ↑ "Tervetuloa varusmiespalvelukseen 6. heinäkuuta!". maavoimat.fi (in Finnish).
  28. ↑ "Venemies". puolustusvoimat.fi (in Finnish). Retrieved 26 July 2026.
  29. ↑ "Tervetuloa palvelukseen 6. heinäkuuta!". maavoimat.fi (in Finnish). Retrieved 24 June 2026.
  30. ↑ "Porin prikaatin varusmieskoulutus". maavoimat.fi (in Finnish). Retrieved 24 June 2026.
  31. ↑ "Tervetuloa palvelukseen Panssariprikaatiin!". maavoimat.fi (in Finnish). Retrieved 24 June 2026.
  32. ↑ "Jaeger Brigade - For conscripts". maavoimat.fi.
  33. ↑ "Varusmiehenä meillä". maavoimat.fi (in Finnish).
  34. ↑ "Serving in the Guard Jaeger Regiment". maavoimat.fi. Retrieved 24 June 2026.
  35. ↑ Nylands brigad Beväringinfo KONTINGENT 2/26 (in Swedish). 2026. p. 28.
  36. ↑ Rajajääkärikomppania Alokasopas 2/26 (in Finnish), Rajavartiolaitos, retrieved 24 July 2026
  37. ↑ "Rajajääkäriksi varusmiespalvelukseen". raja.fi (in Finnish). Retrieved 24 July 2026.
  38. ↑ "Kouluttaudu erikoisrajajääkäriksi". raja.fi (in Finnish). Retrieved 24 July 2026.
  39. ↑ "Facts about Army Academy". maavoimat.fi. Retrieved 24 June 2026.
  40. ↑ Maanpuolustuskorkeakoulu Opinto-opas: Sotatieteiden kandidaatin tutkinnon ja sen lisäksi suoritettavien sotilasammatillisten opintojen opetussuunnitelma 2025 (PDF) (in Finnish). 2025. p. 56. Retrieved 24 June 2026.
  41. ↑ Maanpuolustuskorkeakoulu Opinto-opas: Sotatieteiden maisterin tutkinnon ja sen lisäksi suoritettavien sotilasammatillisten opintojen opetussuunnitelma 2025 (PDF) (in Finnish). 2025.
  42. ↑ Haapanen, Liisa (30 July 2014). "Pioneerikoulu muuttaa Lappeenrantaan ja Haminaan". Yle (in Finnish). Retrieved 24 June 2026.
  43. 1 2 Simola, Seppo (2023). "Aselajivärien vaiheita Suomessa" (PDF). Viestimies (in Finnish). No. 3. p. 42. Retrieved 23 July 2026.
  44. 1 2 "Liite 7", Sotilaspuvussa ja virkapuvussa kannettavat merkit ja tunnukset (PDF) (in Finnish), 25 August 2014, retrieved 23 July 2026
  45. ↑ Helaniemi, Rasmus (30 September 2020). "Seitsemän vuosikymmentä koulutushaaramerkkejä" (in Finnish). Ruotuväki. Retrieved 23 July 2026.
  46. ↑ Liukko, Kimmo (10 June 2019). "Kaupunkijääkärit yhdistävät tulen ja liikkeen - osa 1". Ruotuväki (in Finnish). Retrieved 26 July 2026.

Further reading

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History

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Branch publications

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