Final answer:
The line "Gas! GAS! Quick, boys!" originates from Wilfred Owen's World War I poem "Dulce et Decorum Est," which is known for its powerful depiction of a gas attack and the harsh realities of war.
Step-by-step explanation:
The line "Gas! GAS! Quick, boys!" is from "Dulce et Decorum Est", a war poem written by Wilfred Owen during World War I. This poem is renowned for its vivid imagery and the stark portrayal of the soldiers' experience facing a gas attack.
The poet employs visceral and often harrowing language to communicate the reality of war, contrasting greatly with the romantic ideals often associated with it. "Dulce et Decorum Est" is a Latin phrase meaning 'It is sweet and fitting to die for one's country,' which Owen uses ironically, questioning the commonly held belief.