[1] Based on the 1966 Finnish play Päämajassa by Ilmari Turja, the film describes the mood and atmosphere of the Finnish army headquarters led by Marshal C. G. E. Mannerheim in Mikkeli in the summer of 1944 during the breakthrough of the Karelian Isthmus.

[2][3] Marshal Mannerheim is played by Joel Rinne in his last film role.

Differences of opinion regarding the role of Mannerheim caused dispute between Kassila and Rinne during the filming and led to polemics in the press after the premiere.

[1][5] In the summer of 1944, in the Mikkeli headquarters of the Finnish Defence Forces, in the moments of the resolution of the Continuation War, General Airo gives the attack order without asking the commander-in-chief, Marshal Mannerheim, as the major attack on the Karelian Isthmus approaches.

When the war turns into defeat, dissension in the staff is caused not only by nervous pressure, but also by an anonymously published newspaper article inciting a defeatist mentality and a list of ministers drawn up by the Germans in case of Finland's withdrawal from the war.