BATTLEGROUP SERIES
Battlegroup is Ehasa’s largest and longest-running airsoft event series. It began at Ilveskallio in Hattula in 2016, moved to Padasjoki in 2019, visited Juupavaara in 2022 and returned to Padasjoki in 2023. Since 2024, the event has taken place in Halli, Jämsä.
2026Battlegroup 2026
Nordberg’s factions in Halli
Battlegroup took place in Halli on 22–25 July 2026. A total of 729 players attended: 357 with the Coalition of Nordberg, 346 with the Northern Royal Guard and 26 civilians.
Coalition of Nordberg- 357
Northern Royal Guard- 346
Civilians- 26
2025BATTLEGROUP 25
Bases closer to the front line
Battlegroup 2025 brought over 740 participants to Halli. Moving the bases closer together led to more encounters between the Coalition of Nordberg and the Northern Royal Guard.
- Coalition of Nordberg
- 309
- Civilians
- 44
- Northern Royal Guard
- 318
Northern Iron Rule- 54
2024BATTLEGROUP 24
The Nordberg civil war
Battlegroup 2024 had around 650 participants. The story took place in Nordberg, ruled by the Northern Iron Rule until the 2020s. The Northern Royal Guard and Coalition of Nordberg overthrew the regime in a civil war, then fought over who would govern the country.
- Coalition of Nordberg
- 354
- Civilians
- 17
- Northern Royal Guard
- 273
2023TSTOS 23
The battle for the power plant
TSTOS 2023 had around 550 participants. Its story followed Uusimaa and Pirkanmaa before the events of TSTOS 2020. The factions fought over the power plant and related objectives. The final battle brought Uusimaa, Pirkanmaa and the mysterious Cult together around the plant.
Civilians- 30
Uusimaa- 276
Pirkanmaa- 219
2022TSTOS 22
Missiles at Juupavaara
TSTOS 2022 had more than 500 participants. Sewell Mining and Polaris Energy fought over missiles and the means to launch them. The final fighting took place at the top of Juupavaara, where the missiles’ fate was decided.
- Civilians
- 19
Polaris Energy- 271
Sewell Mining- 192
2021TSTOS 21
Hölböcorp versus EGTC
TSTOS 2021 had over 600 participants. The story followed the conflict between Hölböcorp and EGTC, with civilians and UN forces playing a central role. EGTC’s board of directors was overthrown near the end of the fighting, leaving its future uncertain.
- Civilians
- 23
Hölböcorp- 289
EGTC- 269
UN- 42
2020TSTOS 20
A new faction, a new threat
TSTOS 2020 had more than 500 participants. Uusimaa and Pirkanmaa fought while the UN tried to protect civilians. A new faction, Hölböcorp, brought a missile into the area. Its explosion destroyed both Uusimaa’s and Pirkanmaa’s fighting forces.
- UN
- 24
- Pirkanmaa
- 244
- Uusimaa
- 210
- Civilians
- 29
2019TSTOS 19
The RSV leaves the battlefield
TSTOS 2019 had more than 700 participants and lasted over 90 hours, making it Finland’s longest airsoft event again. The factions competed for the RSV device until it left the area. Rumours suggested it had been destroyed and would not return.
- Uusimaa
- 300
- Pirkanmaa
- 353
- Civilians
- 70
2018TSTOS 18
Gold, secrets and the RSV
TSTOS 2018 was the third event in the series. Over 800 participants played for more than 90 hours. Both main factions sought control of the RSV device, while Remedtech developed it using gold from Ilveskallio’s mines. The CIA operated through Blue Rose as a cover organisation. The mafia controlled the village and some gold reserves in cooperation with the Ilveskallio National Guard.
- Civilians
- 61
- Uusimaa
- 389
- Pirkanmaa
- 298
- Blue Rose
- 2
2017TSTOS 17
Fuel and secret codes
TSTOS 2017 had over 700 participants and lasted a day longer than the previous event. After the destruction of the secret tank hangars, the factions fought over fuel supplies and investigated the RSV device by solving codes.
- Uusimaa
- 379
- Pirkanmaa
- 258
- Civilians
- 45
2016TSTOS 16
It all began at Ilveskallio
TSTOS Parola was Ehasa’s first event to run through a full weekend, with over 600 participants. It began the story of a Finland divided between Uusimaa and Pirkanmaa, fighting for control of Ilveskallio’s secret tank hangars. Independent Åland’s special forces and the UN also entered the conflict.
- Pirkanmaa
- 269
- Uusimaa
- 242
- Civilians
- 21
- Foreign forces
- 43
- UN
- 12
The event series
Known in Finland as TSTOS (Taisteluosasto), Battlegroup has brought together nearly a thousand players from Finland and abroad, from Sweden to Brazil. Games run for several days without resetting the situation; main bases have a night-time ceasefire so players can rest. Dozens of vehicles take part, including real armoured vehicles, off-road vehicles, SUVs and ATVs. Most are in-game and can be destroyed using designated anti-tank weapons. The series is among the longest airsoft events worldwide and the largest in Europe by participant numbers.
The content of the events
The games take place in a fictional world created by game control, combining military simulation, airsoft and roleplay. Players act as soldiers, civilians or members of in-game organisations. Combat factions are led by volunteer squad and platoon leaders, company commanders and battalion commanders.
Partners
Ehasa works with associations including MPK and the Reserve Sports Federation, municipalities including Padasjoki, Hämeenlinna and Jämsä, and the Defence Forces, police, rescue services and Metsähallitus. From 2016 to 2018, MPK course participants helped organise the events as part of the Basics of Organising an Exercise 2 course. They practised organising public events and received Ehasa-funded training, including Finnish Red Cross first-aid and security-steward qualifications. The 2019 event was the first in Padasjoki and the first without MPK cooperation following changes to MPK’s organisation.
Ehasa Oy now runs the events. The cooperation with MPK took place during Ehasa ry’s event operations.
Statistics
In 2026, 729 players attended: 357 played with the Coalition of Nordberg, 346 with the Northern Royal Guard and 26 as civilians.
Registrations from outside Finland
Registrations with a country other than Finland in the registration details.
Countries in registration records
Country information is missing for one registration.
A country breakdown is not available for this year.
A country breakdown is not available for this year.
What is Ehasa?
Ehasa, formerly the East Helsinki Airsoft Association, is a registered association founded in Helsinki. It began with local weekend games and moved to larger events in 2010. It has organised over 50 events across southern and central Finland.
Ehasa organises some of Finland’s largest airsoft events and develops them using player feedback.
Services developed to support the events include the Kuulaportti registration system and Status Ehasa flag tracking. Other event organisers also use these services.
Organisers and volunteer helpers build the event. Their work includes preparing the game area, check-in, chronograph testing, traffic management and running the game.
Ehasa’s events are run by organisers and assistants. At Battlegroup, their tasks include construction, check-in and logistics.
Ehasa ry & Ehasa Oy
Ehasa ry was registered as an association on 7 March 2012. Ehasa Oy was established alongside it, receiving its business ID on 7 December 2025 and entering the Trade Register on 15 January 2026. Ehasa Oy organises the current Battlegroup event.
Ehasa’s organising team grew out of weekend games in Mustavuori, Helsinki, in 2010. The Conquest series began in 2012, and the first TSTOS event took place in Ilveskallio in 2016. Battlegroup moved to Halli in 2024.
Ehasa Oy plans and produces the events. Ehasa ry maintains community services, supports the activities and promotes airsoft in Finland. The association owns half of Ehasa Oy.
Company information: PRH / YTJMore about Ehasa’s history
Media visibility
Jämsän seutu 25.7.2025Open story
Aamulehti 18.7.2024Open story
Jämsän seutu 2.7.2024Open story
Hämeen sanomat video 5.8.2023Open story
Hämeen sanomat 5.8.2023Open story
Yle video 4.8.2023Open story
Yle article 4.8.2023Open story
Hämeen sanomat 30.7.2023Open story
Oriveden sanomat 1.9.2022Open story
Padasjoen sanomat 3.9.2020Open story
Reserviläinen 16.8.2019Open story
Reserviläinen 1.8.2019Open story
Ruotuväki 2.8.2018Open story
Reserviläinen 29.3.2018Open story
Ruotuväki 2017Open story
Reserviläinen 26.6.2017Open story
Ruotuväki 5.8.2016Open story
Reserviläinen 24.7.2016Open story