Corbett: theory supplies a normal case

In Some Principles of Maritime Strategy, Corbett argues that uncertainty increases the need for firm points from which to begin reasoning. Comparative history identifies normal relationships between a war's object, its value to the belligerents, and the operations likely to suit it. It can also reveal recurring effects of particular situations on morale. His navigation analogy shows why variable winds, currents, and storms still reward the study of normal conditions. Commanders may depart from that normal case, and some of the greatest successes depend on doing so, but theory helps them recognize and justify the departure. In councils, a shared theoretical baseline keeps discussion on essential strategic questions and limits distracting side issues.