Has there ever been in history a war in which there were only two sides?

I have always been interested in this question, because I can't think of a single example. It seems like in almost every war, there are always either subfactions within one of the two main factions, or else there are more than two main factions.<br><br>For example, World War II. While we can group all of the Axis Powers together as one side, and all of the Allies together as another side, within those two coalitions, there were several countries with their own armies, political systems, and histories that caused them to act in very different ways, such as Japan and Italy within the Axis powers, and the USA and the UK and the Soviet Union on the Allies side. And there were even factions within these countries, as in the USA, the Soviet Union, and the UK there were political factions that opposed the very idea of going to war in the first place.<br><br>The same can be said for the American Civil War, where it looks like there are two sides (the Union and the Confederacy) but in reality the Confederacy was made up of several individual states that each had their own governments and armies and interests, and within each state there were political factions that opposed the war.<br><br>Throughout all of recorded history, has there ever been one singular war in which there have been only two sides, with no subfactions or smaller political entities within one of the two main coalitions?