Sentence:  Older men declare <WSD>war</WSD>. But it is the youth that must fight and die. It is youth who must inherit the tribulation, the sorrow and the triumphs that are the aftermath of <WSD>war</WSD>. 
Meaning of the word marked with <WSD> tags:  Organized, large-scale, armed conflict between countries or between national, ethnic, or other sizeable groups, usually involving the engagement of military forces.