Uuno is forced to complete his mandatory military service when it is revealed that he only spent one day in the army in his youth. As is typical of the Turhapuro series his family and friends become closely tied in with these events. His friends Härski Hartikainen and Sörsselssön return to the army for a refresher course and by chance Uuno's father-in-law, Councillor Tuura is made the Finnish Defence Minister. In one of the most memorable scenes, Uuno's wife, Elisabeth, dresses as Uuno and substitutes him for a day as Uuno has an apparently urgent meeting (at a restaurant) and while becoming lost in the woods with a malfunctioning radio, Tuura accidentally declares war on Sweden.
A former Red Rebellion leader returns home after being imprisoned for his participation in the Finnish Civil War, but soon finds out that wartime mindsets still linger in the heads of people.
Surgeon Niilo Leino finds out that his former fellow student suffering from fears and insecurity is hired as his colleague. Leino tries to give him opportunities to show his ability but it occurs he hasn't escaped from his fears.
