Who stubbornly refused to follow the old rules of war

Who stubbornly refused to follow the old rules of war/ English

“The real heroes were the masses of ordinary soldiers who fought and died in the belief that they were making the world a better place, and their inventive leaders who stubbornly refused to follow the old rules of war. The single word VIMY stood for them all…”
VIMY, Pierre Berton.
Why do you think Berton says, “The real heroes were the masses of ordinary soldiers…”? Do you agree? Why or why not?

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