“主战论”可以翻译为 "advocacy of war" 或 "pro-war stance"。
Advocacy of war 强调主张或支持战争的观点。
Pro-war stance 突出支持战争的立场或态度。
具体使用可根据语境选择，例如：
The advocacy of war by some politicians has sparked controversy.（一些政客的主战论引发了争议。）
His pro-war stance alienated many of his colleagues.（他的主战立场使许多同事疏远了他。）