Sven Tuuva, the simple son of an elderly sergeant, takes part in the battles of the Finnish war with General Sandels.

Sven Tuuva, the simple son of an elderly sergeant, takes part in the battles of the Finnish war with General Sandels. Corporal Örn and Captain Duncker help Sven cope with the problems caused by his simplicity. The film culminates in the Battle of Koljonvirta, where Sven rises to heroic status.