Despite widespread emphasis on the importance of winning the war of ideas in recent strategic literature, we find few analytical studies of wars of ideas as such. With that in mind, this monograph offers a brief examination of four common types of wars of ideas, and uses that as a basis for analyzing how the United States and its allies and strategic partners might proceed in the current war of ideas. Scoping the Problem. Simply put, a war of ideas is a clash of visions, concepts, and images, and- especially-the interpretation of them. They are, indeed, genuine wars, even though the physical violence might be minimal, because they serve a political, socio-cultural, or economic purpose, and they involve hostile intentions or hostile acts. Wars of ideas can assume many forms, but they tend to fall into four general categories (though these are not necessarily exhaustive): (a) intellectual debates, (b) ideological wars, (c) wars over religious dogma, and (d) advertising campaigns. All of them are essentially about power and influence, just as with wars over territory and material resources, and their stakes, can run very high indeed. Intellectual Debates are disputes in which opposing sides advance their arguments, support them with evidence, and endeavor to refute the reasoning and conclusions of the other. Examples include the ongoing debate between Pro-Choice and Pro-Life advocates, and therecent dispute between the theories of "intelligent design" and evolution. Ideological Wars are a clash of broad visions usually organized around a doctrine, whether secular or non-secular. The most popular example of an ideological conflict is the Cold War, which involved political, economic, and military competition between the United States and the Soviet Union and their respective allies. Disputes over Religious Dogma are a form of intellectual debate, but they center on conflicting interpretations of sacred tenets or texts, the access to which can be, and often is, deliberately restricted or otherwise limited. Examples include the Sunni-Shiite split within Islam and Catholicism's East-West schism. Advertising Campaigns are contests between competing producers or vendors for "market share." The objective of such campaigns is to persuade audiences to take desired actions, such as voting for a particular candidate, visiting a certain place, or buying a specific product. A classic example is the "Cola Wars" between Coca Cola and Pepsi-Cola. Inconclusive outcomes are not unusual in wars of ideas. Opposing sides seldom change their positions based on the introduction of new evidence, or new ways of evaluating existing evidence. Thus, wars of ideas are rarely settled on the merits of the ideas themselves. Instead, they tend to drag on, unless an event occurs that causes the belligerents to focus their attention elsewhere. When conclusive outcomes do occur, they tend to follow the physical elimination or marginalization of one side's key proponents. In other cases, a major event, such as the collapse of the Soviet Union, might occur that renders one side incapable of continuing the conflict or campaign. Thus, physical events, whether designed or incidental, are in some respects more important to the course and outcome of a war of ideas than the ideas themselves.