What is the primary purpose of an attack line versus a defense line on the fireground?

• A. Attack line is used to prevent fire growth and protect exposures; defense line extinguishes
• B. Attack line applies water to extinguish and facilitate rescue; defense line prevents fire growth and protects exposures
• C. Attack line exterior; defense line interior
• D. Both lines have identical purposes

Answer: (B)

The main idea is that two types of hose lines on the fireground serve different goals. An attack line is brought to the fire to apply water directly to the flames, with the aim of extinguishing the fire and creating conditions that allow for rescue and search. A defense line is used from a safer position to keep the fire from growing and to shield exposures, protecting adjacent property and people by preventing spread and limiting heat and flame exposure. This distinction explains why the attack line focuses on putting the fire out and facilitating rescue, while the defense line focuses on containment and protection of exposures.