This page isn’t finished yet. I’m still updating.
List by Production Country
Ten German War Movies You Must See Before You Die
Twelve Russian war Movies You Must See
List by Conflict
Movies on the Spanish Civil War
List by Topics
War Romances – A Very Long List
Other Lists
Top 10 War Movies – The Guardian List
All About War Movies 
I can not find it, but there is an Australian film called Galipoli about World war I, One of Mel Gibson’s first films. When it comes to romantic war films there is The best years of our lives from 1946, about US soldiers coming home from war and adjusting to home life.