On February 27, 1943, nine Norwegian commandos sabotaged the German-held Vemork plant outside of Rjukan, Norway. Operation Gunnerside successfully set back Germany's atomic bomb program.
Gallery
The three isotopes of hydrogen. Image by Lamiot for french version, from Dirk Hünniger [GFDL (http://www.gnu.org/copyleft/fdl.html), via Wikimedia Commons.
Norwegian volunteers in battle gear, somewhere in Northern Finland. (Jan. 1940). Operation Gunnerside members wore similar attire. Photo Credit: [Public domain], via Wikimedia Commons.
Bridge to Vemork Plant. Photo by martin_vmorris (Norsk Hydro power plant, Rjukin, Norway), via Wikimedia Commons.