Defilade refers to terrain that provides protection from observation and fire by using:

• A. A high ground vantage point
• B. A terrain feature that shields from observation and fire
• C. Armored protection
• D. Electronic countermeasures

Answer: (B)

Defilade is about using the terrain itself to stay hidden from the enemy’s observation and to shield you from direct fire. By placing troops behind a crest, in a trench, a depression, or behind any feature that blocks line of sight and the trajectory of incoming rounds, you reduce exposure while still allowing you to see and engage as needed. This concept relies on the geometry of the battlefield—hiding behind something that interrupts the enemy’s view and their ability to fire accurately.

Using a high ground vantage point isn't defilade, because it typically increases visibility and exposure to enemy fire, even if it provides better observation. Armored protection and electronic countermeasures are forms of protection, but they don’t describe using terrain to shield from observation and fire as defilade does.