"great heroism" is correct and usable in written English.
It can be used to describe a heroic action or quality. For example, "John's great heroism during the battle made him a hero in his hometown."
The dangers have proven to be occasions for great heroism.
I believe people are capable of great villainy and great heroism -- the same person".
His 1945 citation for the Silver Star read, in part: "Lieutenant Weiss' great heroism [was] materially responsible for trapped units being able to hold out against overwhelming odds.
In risking his life to carry out a dramatic subterfuge to vaccinate the camp's most endangered prisoners, Fleck performed an act of great heroism.
All morning the Confederates drove the blue coats northward in a carnival of carnage that left the mutilated bodies of both sides strewn in heaps amid great heroism and equally great cowardice.
It had been inculcated in her from birth that the Soviet Union, through great heroism and sacrifice, had rescued the nation and the civilized world from the scourge of fascism.
You are alive!" And what if the greatest heroism is in a moment in which the marvel of the world reveals itself in its most quotidian workings.
George Cross, a British civilian and military decoration, instituted in 1940 by King George VI for "acts of the greatest heroism or of the most conspicuous courage in circumstances of extreme danger".
All the songs on "The Rising" reach a point where the singer warily considers a future of being alone, and concludes, as Springsteen has again and again over the years, that perseverance is the greatest heroism.
There is no greater heroism in wartime than facing down one's fears and acting with compassion.
Songs about Ho Chi Minh, and examples of great communist heroism were the standard.
