What is a secondary attack line and when is it typically used?

• A. A line used only for ventilation.
• B. A backup line to support primary attack, used to ensure constant water supply if the first line fails or to provide additional help.
• C. A line used to remove smoke.
• D. A line used to set up containment.

Answer: (B)

A secondary attack line is a backup water line brought in to support the initial interior fire attack. It’s used to provide additional water and reach when the primary line isn’t enough, and to keep suppression going if the first line’s water supply is interrupted or compromised. This extra line gives crews more help and flexibility to control the fire, rather than handling tasks like ventilation or containment, which are addressed with other tactics.