See link below for a comprehensive list of anti-war songs.
Hope you find the one you need.
"Eve of Destruction"
"Feel Like I'm Fixin' to Die Rag"
"Give Peace a Chance"
Of course, there are many more. We hippies are old now, so we forget. I DO remember never expecting to get 'old.'
"For What It's Worth" is a GREAT song.
I don't know what "for what it's worth" is like, but you should check out "Marmalades: Reflections of my Life." It's a really powerful anti-war song, and is usually played with Vietnam documentaries.
Country Joe and the Fish
Give peace a chance- John Lennon.
similar to "for what it's worth"?