Many references to "the war of ideas" have appeared in defense literature recently. However, few of them actually shed any light on what wars of ideas are. This monograph, by Dr. Antulio J. Echevarria II, begins by classifying several types of wars of ideas. It is important to note, as the author points out, that physical events, whether intended or incidental, can play determining roles in the ways these kinds of conflicts unfold, and how (or whether) they are resolved. In other words, because ideas are interpreted subjectively, it is not likely that opposing parties will "win" each other over by means of an ideational campaign alone. Moreover, third parties may consider the actions of the belligerents as much more important than the collective merits of their ideas.