This post is part of the Principles of War series. See the introductory post or browse all posts with the principles of war tag.

Modern war demands a high degree of flexibility to enable pre-arranged plans to be altered to meet changing situations and unexpected developments. This entails good training, organization, discipline and staff work, and, above all, that flexibility of mind and rapidity of decision on the part of both the Commander and his subordinates which ensures that time is never lost. It calls also for physical mobility of a high order, both strategically and tactically, so that our forces can be concentrated rapidly and economically at decisive places and times.

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