14. A good network of roads and trails saves wear and tear of vehicles and makes rapid movement possible.

15. The state of roads and trails may change rapidly and appreciably under the influence of weather conditions, especially snow and frost, and through heavy use. This circumstance must be taken into account in planning and carrying out movements.

16. Gently rolling country which slopes away slightly toward the enemy and affords a measure of cover provides the most favorable conditions for an attack by motorized infantry in vehicle. It offers positions for fire halts on reverse slopes, and for good observation.

Steep inclines slow down an attack in vehicles. In surmounting rises the armored personnel carriers show up clearly on the skyline and afford sharply defined targets.

17. Hollows, valleys, and ravines are suitable for the assembly and forming up of vehicles if the neighboring high land is in our hands. They make an attack over a wide front more difficult. Valleys and ravines running in the direction of the attack are blocked easily by the enemy.

In deploying and in attack, narrow valleys and ravines compel distribution, in depth. On emerging from them, there is delay in resuming battle order on a broad front.

18. Marshes are practicable for armored personnel carriers only in winter when the ground is frozen.

19. Woods and mountains often present great difficulties for the movement of armored personnel carriers off the roads and trails. Deployment is possible only in thinly wooded districts and in wide and flat valleys.

20. Villages and woods restrict the movements of infantry on motorized vehicles. Barriers and obstacles are likely to be encountered suddenly and unexpectedly. Villages and woods favor close attacks by the enemy.