What was the cleanest war ever fought?

Question

If not all, the vast majority of wars in known history were dirty, cruel and with a lot of civilian casualties. That makes me wonder if there has ever been a "clean" war where both sides played "by the rules"? The criteria would be: * Minimal civilian causalities * The war started with a declaration of war * No illegal weapons (biological, chemical etc.) used * The war ended with a treaty * No or minimal propaganda was used * The two sides have similar stands on the reasons why the war started

Answer 1

The Cold War. Because it waa not actually fought.