Largely unnoticed by his science fiction readership but hinted at by his Future at War series , it proved him a scholar of varied talents .
In 1969 , Bretnor published a book on warfare titled Decisive Warfare : A Study in Military Theory .
Largely unnoticed by Bretnor 's science fiction readership but hinted at by his Future at War series , it proved him a scholar of varied talents .
In 1969 , Bretnor published a book on warfare titled Decisive Warfare : A Study in Military Theory .