Normally indirect fires would be used to reinforce which type of wire obstacles?

• A. Main
• B. Boundary
• C. Protective
• D. Tactical and Supplementary

Answer: (D)

Indirect fires are used to enhance obstacles by hitting likely crossing points from a distance, creating a delay, disruption, and suppression that makes breaching harder. This approach fits obstacles whose purpose is to shape the attacker’s movement and deepen the defense across a belt of danger. Tactical obstacles are designed to channel and slow the enemy, while supplementary obstacles are added to reinforce or fill gaps in the primary barrier. Using artillery or mortars to suppress, disrupt engineers, and create opportunities to deny or complicate crossings keeps the main wire belt intact while increasing its effectiveness. Boundary obstacles mark edges and aren’t typically reinforced by indirect fire in the same way; protective obstacles are focused on shielding a position and are usually backed by direct or near-contact fire.