The noted Karl von Clausewitz (1780-1831), Prussian strategist and general, stated in his renowned work On War: “War is not an exercise of will directed at inanimate matter, as is the case with the mechanical arts, or at matter that is animated but passive and docile, as is the case with mind and human emotions in the arts. In war, the will is directed at a reactive animated object.” In turn, Alfred T. Mahan, renowned historian, and strategist of the U.S. Navy (1840-1914), stated: “Possession of a powerful fleet is essential to ensure national security and trade, as it protects shipping lanes and projects naval power globally.” This work deals with the critical and propositional analysis of these concepts – as well as others equally valuable and complementary – while delving into theories of war and strategic leadership, as a contribution of the teachers and students of the first cohort of the Doctorate in Strategic Studies, Security and Defense, of the Escuela Superior de Guerra “General Rafael Reyes Prieto”, to the study and research of these pertinent topics, so indispensable to understand Colombia of the last 50 years.