... defense: (a) Arrangement in depth. The most dependable defense is in prearranged counter attacks. The system of defense must react like a helical spring. (b) Tenacity of defense. 1. Each unit must be prepared to hold its post to the last extremity. 2. Orders to withdraw will never be obeyed unless unmistakably valid. 3. All ground lost must be retaken at once in counter attack ... — Military Instructors Manual • James P. Cole and Oliver Schoonmaker
...
