The greatest triumphant character of all is the spirit Sisu, which is the main core of Finland’s culture and values.
Wikipedia defines Sisu as being a “grim, gritty, white-knuckle form of courage that is presented typically in situations where success is against the odds. It expresses itself in taking action against the odds and displaying courage and resoluteness in the face of adversity, in other words, deciding on a course of action and then sticking to that decision, even despite repeated failures. It is a term for going beyond one’s mental or physical capacity.”
Sisu oftentimes finds itself neglected and embraced by its characters in Deep River; but the one character who doesn’t grasp Sisu deeply enough is Aino. Aino has plenty of courage, determination, hard work, sacrifice, hope, and even faith in her fellow human beings who are socialists, but the one thing she seems to lack is love and the capacity to feel that love.
This stranger refuses to surrender to any emotion, thought, idea, or feeling unless it is for the socialist idea, which she campaigns, writes, gives speeches, passes red cards out, and travels abroad for. She gains fame in newspapers by being on the front lines of the socialist movement particularly the Industrial Workers of the World (IWW).
Aino ignores Kyllikki’s advice and travels to Portland, Oregon, where she convinces the workers from the sawmills near the Willamette River to attend the upcoming Armistice Parade, which turns out to be a disaster.