Clausewitz wrote that there are three ways armies could learn about warfare. The most obvious and best was experience. Battlefield experience was best, but peacetime maneuvers could serve as a potentially useful substitute since from them officers and soldiers could learn to recognize and cope with some of the natural friction of the real battlefield. The chapter considers the salient lessons from the Army's three experiences against the Filipino, Moro, and Cuban insurgents. It shows that the minimalist doctrine that the Army produced from its own experience. The chapter discusses the evolution of the Marine Corps Schools and, as such, forms the institutional backdrop for the small wars training and doctrine formation that took place in the late 1920s and early 1930s. It describes the changes in Marine thought over the period by highlighting Corps doctrine pre-Haiti. As the Marines went into Haiti they were officially exposed to the Army's view of small wars generated from their Philippine experiences.