Polish Brigadier General Emil August Fieldorf "Nil".
 
He was a Polish World War II hero, fighting Nazi Germans at the beginning of the war. From 1942 a commander of  Kedyw (special operations executive) of  AK (Polish Home Army). From 1944 deputy commander-in-chief of AK. Killed by communists on 24.02.1953 in Mokotow prison in Warsaw. 
 
More information; https://en.wikipedia.org/wiki/Emil_August_Fieldorf.