In a residential structure fire, how many engines constitute the primary suppression apparatus?

• A. First 3 engines
• B. First 2 engines
• C. First 4 engines
• D. First 1 engine

Answer: (B)

In a residential structure fire, the immediate suppression work is carried out by two engine companies. The first engine leads the attack, bringing a handline to bear on the fire and beginning to apply water. The second engine establishes the water supply, pumping water to the first engine either from a hydrant or from its own pump, so the attack line can keep flowing without the first engine running dry or losing pressure. This pairing ensures a quick, sustained knockdown with a reliable water source, which is essential for the initial, concentrated suppression effort. Additional engines may then take on support roles (second lines, stair/ladder tasks, or back-up water supply) as needed, but the core, on-scene suppression push relies on these two engines.