Basic Principles

• Defence in depth
  Mutual Support (e.g. by crossfire)
  All round defence

Fighting withdrawal

• Reserved demolitions
  Scorched earth
  Booby traps
  – Minefields
  Trench warfare

Counter attack

• Counter battery fire
  Rapid reaction force

Delaying Defence

• Break contact

Hedgehog defence

• military bottleneck

Sources: Wikipedia Modified by Fanterazzi