How was Bertha von Suttner awarded the Nobel Prize Peace?

Name: Bertha von Suttner .
Country: Austria-Hungary.
Date of Birth: 9 June 1843.
Died: 21 June 1914.
Known as: Generalissimo of the peace movement.
Noble Prize Year: Nobel Prize for Peace in 1905, for her audacity to oppose the horrors of war.